iron blue
         n 1: slightly purplish or bluish dark grey [syn: {iron blue},
               {steel grey}, {steel gray}, {Davy's grey}, {Davy's gray}]
         2: any of various blue pigments [syn: {iron blue}, {Prussian
            blue}]

English Dictionary: iron boot	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
iron boot n an instrument of torture that is used to heat or crush the foot and leg Synonym(s): boot, the boot, iron boot, iron heel
From WordNet (r) 3.0 (2006) [wn]:
iron filing n a fragment of iron rubbed off by the use of a file
From WordNet (r) 3.0 (2006) [wn]:
iron fist n rigorous or ruthless control; "she rules the office with an iron fist"; "it takes an iron fist to contain the dissenting factions"
From WordNet (r) 3.0 (2006) [wn]:
iron foundry n a foundry where cast iron is produced
From WordNet (r) 3.0 (2006) [wn]:
iron overload n pathology in which iron accumulates in the tissues; characterized by bronzed skin and enlarged liver and diabetes mellitus and abnormalities of the pancreas and the joints Synonym(s): hemochromatosis, iron-storage disease, iron overload, bronzed diabetes
From WordNet (r) 3.0 (2006) [wn]:
iron perchloride n a highly toxic chemical used to engrave metal plates and electronic circuits
From WordNet (r) 3.0 (2006) [wn]:
iron putty n a cement resembling putty; made by mixing ferric oxide and boiled linseed oil; is acid resistant
From WordNet (r) 3.0 (2006) [wn]:
iron pyrite n a common mineral (iron disulfide) that has a pale yellow color Synonym(s): pyrite, iron pyrite, fool's gold
From WordNet (r) 3.0 (2006) [wn]:
irremovable adj incapable of being removed or away or dismiss; "irremovable boulders"; "irremovable obstacles" Antonym(s): removable
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
4. To bring to a certain state or condition by grinding,             pounding, kneading, rubbing, etc.; as, to reduce a             substance to powder, or to a pasty mass; to reduce fruit,             wood, or paper rags, to pulp.                         It were but right And equal to reduce me to my dust.                                                                               --Milton.          5. To bring into a certain order, arrangement,             classification, etc.; to bring under rules or within             certain limits of descriptions and terms adapted to use in             computation; as, to reduce animals or vegetables to a             class or classes; to reduce a series of observations in             astronomy; to reduce language to rules.          6. (Arith.)             (a) To change, as numbers, from one denomination into                   another without altering their value, or from one                   denomination into others of the same value; as, to                   reduce pounds, shillings, and pence to pence, or to                   reduce pence to pounds; to reduce days and hours to                   minutes, or minutes to days and hours.             (b) To change the form of a quantity or expression without                   altering its value; as, to reduce fractions to their                   lowest terms, to a common denominator, etc.          7. (Chem.) To bring to the metallic state by separating from             impurities; hence, in general, to remove oxygen from; to             deoxidize; to combine with, or to subject to the action             of, hydrogen; as, ferric iron is reduced to ferrous iron;             or metals are reduced from their ores; -- opposed to             {oxidize}.          8. (Med.) To restore to its proper place or condition, as a             displaced organ or part; as, to reduce a dislocation, a             fracture, or a hernia.          {Reduced iron} (Chem.), metallic iron obtained through             deoxidation of an oxide of iron by exposure to a current             of hydrogen or other reducing agent. When hydrogen is used             the product is called also {iron by hydrogen}.          {To reduce an equation} (Alg.), to bring the unknown quantity             by itself on one side, and all the known quantities on the             other side, without destroying the equation.          {To reduce an expression} (Alg.), to obtain an equivalent             expression of simpler form.          {To reduce a square} (Mil.), to reform the line or column             from the square.          Syn: To diminish; lessen; decrease; abate; shorten; curtail;                impair; lower; subject; subdue; subjugate; conquer.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iron \I"ron\ ([imac]"[ucr]rn), a. [AS. [c6]ren, [c6]sen. See       {Iron}, n.]       1. Of, or made of iron; consisting of iron; as, an iron bar,             dust.          2. Resembling iron in color; as, iron blackness.          3. Like iron in hardness, strength, impenetrability, power of             endurance, insensibility, etc.; as:             (a) Rude; hard; harsh; severe.                               Iron years of wars and dangers.   --Rowe.                               Jove crushed the nations with an iron rod.                                                                               --Pope.             (b) Firm; robust; enduring; as, an iron constitution.             (c) Inflexible; unrelenting; as, an iron will.             (d) Not to be broken; holding or binding fast; tenacious.                   [bd]Him death's iron sleep oppressed.[b8] --Philips.          Note: Iron is often used in composition, denoting made of                iron, relating to iron, of or with iron; producing                iron, etc.; resembling iron, literally or figuratively,                in some of its properties or characteristics; as,                iron-shod, iron-sheathed, iron-fisted, iron-framed,                iron-handed, iron-hearted, iron foundry or                iron-foundry.          {Iron age}.             (a) (Myth.) The age following the golden, silver, and                   bronze ages, and characterized by a general                   degeneration of talent and virtue, and of literary                   excellence. In Roman literature the Iron Age is                   commonly regarded as beginning after the taking of                   Rome by the Goths, A. D. 410.             (b) (Arch[91]ol.) That stage in the development of any                   people characterized by the use of iron implements in                   the place of the more cumbrous stone and bronze.          {Iron cement}, a cement for joints, composed of cast-iron             borings or filings, sal ammoniac, etc.          {Iron clay} (Min.), a yellowish clay containing a large             proportion of an ore of iron.          {Iron cross}, a Prussian order of military merit; also, the             decoration of the order.          {Iron crown}, a golden crown set with jewels, belonging             originally to the Lombard kings, and indicating the             dominion of Italy. It was so called from containing a             circle said to have been forged from one of the nails in             the cross of Christ.          {Iron flint} (Min.), an opaque, flintlike, ferruginous             variety of quartz.          {Iron founder}, a maker of iron castings.          {Iron foundry}, the place where iron castings are made.          {Iron furnace}, a furnace for reducing iron from the ore, or             for melting iron for castings, etc.; a forge; a             reverberatory; a bloomery.          {Iron glance} (Min.), hematite.          {Iron hat}, a headpiece of iron or steel, shaped like a hat             with a broad brim, and used as armor during the Middle             Ages.          {Iron horse}, a locomotive engine. [Colloq.]          {Iron liquor}, a solution of an iron salt, used as a mordant             by dyers.          {Iron man} (Cotton Manuf.), a name for the self-acting             spinning mule.          {Iron} {mold [or] mould}, a yellow spot on cloth stained by             rusty iron.          {Iron ore} (Min.), any native compound of iron from which the             metal may be profitably extracted. The principal ores are             magnetite, hematite, siderite, limonite, G[94]thite,             turgite, and the bog and clay iron ores.          {Iron pyrites} (Min.), common pyrites, or pyrite. See             {Pyrites}.          {Iron sand}, an iron ore in grains, usually the magnetic iron             ore, formerly used to sand paper after writing.          {Iron scale}, the thin film which on the surface of wrought             iron in the process of forging. It consists essentially of             the magnetic oxide of iron, {Fe3O4>}.          {Iron works}, a furnace where iron is smelted, or a forge,             rolling mill, or foundry, where it is made into heavy             work, such as shafting, rails, cannon, merchant bar, etc.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iron \I"ron\ ([imac]"[ucr]rn), a. [AS. [c6]ren, [c6]sen. See       {Iron}, n.]       1. Of, or made of iron; consisting of iron; as, an iron bar,             dust.          2. Resembling iron in color; as, iron blackness.          3. Like iron in hardness, strength, impenetrability, power of             endurance, insensibility, etc.; as:             (a) Rude; hard; harsh; severe.                               Iron years of wars and dangers.   --Rowe.                               Jove crushed the nations with an iron rod.                                                                               --Pope.             (b) Firm; robust; enduring; as, an iron constitution.             (c) Inflexible; unrelenting; as, an iron will.             (d) Not to be broken; holding or binding fast; tenacious.                   [bd]Him death's iron sleep oppressed.[b8] --Philips.          Note: Iron is often used in composition, denoting made of                iron, relating to iron, of or with iron; producing                iron, etc.; resembling iron, literally or figuratively,                in some of its properties or characteristics; as,                iron-shod, iron-sheathed, iron-fisted, iron-framed,                iron-handed, iron-hearted, iron foundry or                iron-foundry.          {Iron age}.             (a) (Myth.) The age following the golden, silver, and                   bronze ages, and characterized by a general                   degeneration of talent and virtue, and of literary                   excellence. In Roman literature the Iron Age is                   commonly regarded as beginning after the taking of                   Rome by the Goths, A. D. 410.             (b) (Arch[91]ol.) That stage in the development of any                   people characterized by the use of iron implements in                   the place of the more cumbrous stone and bronze.          {Iron cement}, a cement for joints, composed of cast-iron             borings or filings, sal ammoniac, etc.          {Iron clay} (Min.), a yellowish clay containing a large             proportion of an ore of iron.          {Iron cross}, a Prussian order of military merit; also, the             decoration of the order.          {Iron crown}, a golden crown set with jewels, belonging             originally to the Lombard kings, and indicating the             dominion of Italy. It was so called from containing a             circle said to have been forged from one of the nails in             the cross of Christ.          {Iron flint} (Min.), an opaque, flintlike, ferruginous             variety of quartz.          {Iron founder}, a maker of iron castings.          {Iron foundry}, the place where iron castings are made.          {Iron furnace}, a furnace for reducing iron from the ore, or             for melting iron for castings, etc.; a forge; a             reverberatory; a bloomery.          {Iron glance} (Min.), hematite.          {Iron hat}, a headpiece of iron or steel, shaped like a hat             with a broad brim, and used as armor during the Middle             Ages.          {Iron horse}, a locomotive engine. [Colloq.]          {Iron liquor}, a solution of an iron salt, used as a mordant             by dyers.          {Iron man} (Cotton Manuf.), a name for the self-acting             spinning mule.          {Iron} {mold [or] mould}, a yellow spot on cloth stained by             rusty iron.          {Iron ore} (Min.), any native compound of iron from which the             metal may be profitably extracted. The principal ores are             magnetite, hematite, siderite, limonite, G[94]thite,             turgite, and the bog and clay iron ores.          {Iron pyrites} (Min.), common pyrites, or pyrite. See             {Pyrites}.          {Iron sand}, an iron ore in grains, usually the magnetic iron             ore, formerly used to sand paper after writing.          {Iron scale}, the thin film which on the surface of wrought             iron in the process of forging. It consists essentially of             the magnetic oxide of iron, {Fe3O4>}.          {Iron works}, a furnace where iron is smelted, or a forge,             rolling mill, or foundry, where it is made into heavy             work, such as shafting, rails, cannon, merchant bar, etc.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iron \I"ron\ ([imac]"[ucr]rn), a. [AS. [c6]ren, [c6]sen. See       {Iron}, n.]       1. Of, or made of iron; consisting of iron; as, an iron bar,             dust.          2. Resembling iron in color; as, iron blackness.          3. Like iron in hardness, strength, impenetrability, power of             endurance, insensibility, etc.; as:             (a) Rude; hard; harsh; severe.                               Iron years of wars and dangers.   --Rowe.                               Jove crushed the nations with an iron rod.                                                                               --Pope.             (b) Firm; robust; enduring; as, an iron constitution.             (c) Inflexible; unrelenting; as, an iron will.             (d) Not to be broken; holding or binding fast; tenacious.                   [bd]Him death's iron sleep oppressed.[b8] --Philips.          Note: Iron is often used in composition, denoting made of                iron, relating to iron, of or with iron; producing                iron, etc.; resembling iron, literally or figuratively,                in some of its properties or characteristics; as,                iron-shod, iron-sheathed, iron-fisted, iron-framed,                iron-handed, iron-hearted, iron foundry or                iron-foundry.          {Iron age}.             (a) (Myth.) The age following the golden, silver, and                   bronze ages, and characterized by a general                   degeneration of talent and virtue, and of literary                   excellence. In Roman literature the Iron Age is                   commonly regarded as beginning after the taking of                   Rome by the Goths, A. D. 410.             (b) (Arch[91]ol.) That stage in the development of any                   people characterized by the use of iron implements in                   the place of the more cumbrous stone and bronze.          {Iron cement}, a cement for joints, composed of cast-iron             borings or filings, sal ammoniac, etc.          {Iron clay} (Min.), a yellowish clay containing a large             proportion of an ore of iron.          {Iron cross}, a Prussian order of military merit; also, the             decoration of the order.          {Iron crown}, a golden crown set with jewels, belonging             originally to the Lombard kings, and indicating the             dominion of Italy. It was so called from containing a             circle said to have been forged from one of the nails in             the cross of Christ.          {Iron flint} (Min.), an opaque, flintlike, ferruginous             variety of quartz.          {Iron founder}, a maker of iron castings.          {Iron foundry}, the place where iron castings are made.          {Iron furnace}, a furnace for reducing iron from the ore, or             for melting iron for castings, etc.; a forge; a             reverberatory; a bloomery.          {Iron glance} (Min.), hematite.          {Iron hat}, a headpiece of iron or steel, shaped like a hat             with a broad brim, and used as armor during the Middle             Ages.          {Iron horse}, a locomotive engine. [Colloq.]          {Iron liquor}, a solution of an iron salt, used as a mordant             by dyers.          {Iron man} (Cotton Manuf.), a name for the self-acting             spinning mule.          {Iron} {mold [or] mould}, a yellow spot on cloth stained by             rusty iron.          {Iron ore} (Min.), any native compound of iron from which the             metal may be profitably extracted. The principal ores are             magnetite, hematite, siderite, limonite, G[94]thite,             turgite, and the bog and clay iron ores.          {Iron pyrites} (Min.), common pyrites, or pyrite. See             {Pyrites}.          {Iron sand}, an iron ore in grains, usually the magnetic iron             ore, formerly used to sand paper after writing.          {Iron scale}, the thin film which on the surface of wrought             iron in the process of forging. It consists essentially of             the magnetic oxide of iron, {Fe3O4>}.          {Iron works}, a furnace where iron is smelted, or a forge,             rolling mill, or foundry, where it is made into heavy             work, such as shafting, rails, cannon, merchant bar, etc.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iron \I"ron\ ([imac]"[ucr]rn), a. [AS. [c6]ren, [c6]sen. See       {Iron}, n.]       1. Of, or made of iron; consisting of iron; as, an iron bar,             dust.          2. Resembling iron in color; as, iron blackness.          3. Like iron in hardness, strength, impenetrability, power of             endurance, insensibility, etc.; as:             (a) Rude; hard; harsh; severe.                               Iron years of wars and dangers.   --Rowe.                               Jove crushed the nations with an iron rod.                                                                               --Pope.             (b) Firm; robust; enduring; as, an iron constitution.             (c) Inflexible; unrelenting; as, an iron will.             (d) Not to be broken; holding or binding fast; tenacious.                   [bd]Him death's iron sleep oppressed.[b8] --Philips.          Note: Iron is often used in composition, denoting made of                iron, relating to iron, of or with iron; producing                iron, etc.; resembling iron, literally or figuratively,                in some of its properties or characteristics; as,                iron-shod, iron-sheathed, iron-fisted, iron-framed,                iron-handed, iron-hearted, iron foundry or                iron-foundry.          {Iron age}.             (a) (Myth.) The age following the golden, silver, and                   bronze ages, and characterized by a general                   degeneration of talent and virtue, and of literary                   excellence. In Roman literature the Iron Age is                   commonly regarded as beginning after the taking of                   Rome by the Goths, A. D. 410.             (b) (Arch[91]ol.) That stage in the development of any                   people characterized by the use of iron implements in                   the place of the more cumbrous stone and bronze.          {Iron cement}, a cement for joints, composed of cast-iron             borings or filings, sal ammoniac, etc.          {Iron clay} (Min.), a yellowish clay containing a large             proportion of an ore of iron.          {Iron cross}, a Prussian order of military merit; also, the             decoration of the order.          {Iron crown}, a golden crown set with jewels, belonging             originally to the Lombard kings, and indicating the             dominion of Italy. It was so called from containing a             circle said to have been forged from one of the nails in             the cross of Christ.          {Iron flint} (Min.), an opaque, flintlike, ferruginous             variety of quartz.          {Iron founder}, a maker of iron castings.          {Iron foundry}, the place where iron castings are made.          {Iron furnace}, a furnace for reducing iron from the ore, or             for melting iron for castings, etc.; a forge; a             reverberatory; a bloomery.          {Iron glance} (Min.), hematite.          {Iron hat}, a headpiece of iron or steel, shaped like a hat             with a broad brim, and used as armor during the Middle             Ages.          {Iron horse}, a locomotive engine. [Colloq.]          {Iron liquor}, a solution of an iron salt, used as a mordant             by dyers.          {Iron man} (Cotton Manuf.), a name for the self-acting             spinning mule.          {Iron} {mold [or] mould}, a yellow spot on cloth stained by             rusty iron.          {Iron ore} (Min.), any native compound of iron from which the             metal may be profitably extracted. The principal ores are             magnetite, hematite, siderite, limonite, G[94]thite,             turgite, and the bog and clay iron ores.          {Iron pyrites} (Min.), common pyrites, or pyrite. See             {Pyrites}.          {Iron sand}, an iron ore in grains, usually the magnetic iron             ore, formerly used to sand paper after writing.          {Iron scale}, the thin film which on the surface of wrought             iron in the process of forging. It consists essentially of             the magnetic oxide of iron, {Fe3O4>}.          {Iron works}, a furnace where iron is smelted, or a forge,             rolling mill, or foundry, where it is made into heavy             work, such as shafting, rails, cannon, merchant bar, etc.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iron \I"ron\ ([imac]"[ucr]rn), a. [AS. [c6]ren, [c6]sen. See       {Iron}, n.]       1. Of, or made of iron; consisting of iron; as, an iron bar,             dust.          2. Resembling iron in color; as, iron blackness.          3. Like iron in hardness, strength, impenetrability, power of             endurance, insensibility, etc.; as:             (a) Rude; hard; harsh; severe.                               Iron years of wars and dangers.   --Rowe.                               Jove crushed the nations with an iron rod.                                                                               --Pope.             (b) Firm; robust; enduring; as, an iron constitution.             (c) Inflexible; unrelenting; as, an iron will.             (d) Not to be broken; holding or binding fast; tenacious.                   [bd]Him death's iron sleep oppressed.[b8] --Philips.          Note: Iron is often used in composition, denoting made of                iron, relating to iron, of or with iron; producing                iron, etc.; resembling iron, literally or figuratively,                in some of its properties or characteristics; as,                iron-shod, iron-sheathed, iron-fisted, iron-framed,                iron-handed, iron-hearted, iron foundry or                iron-foundry.          {Iron age}.             (a) (Myth.) The age following the golden, silver, and                   bronze ages, and characterized by a general                   degeneration of talent and virtue, and of literary                   excellence. In Roman literature the Iron Age is                   commonly regarded as beginning after the taking of                   Rome by the Goths, A. D. 410.             (b) (Arch[91]ol.) That stage in the development of any                   people characterized by the use of iron implements in                   the place of the more cumbrous stone and bronze.          {Iron cement}, a cement for joints, composed of cast-iron             borings or filings, sal ammoniac, etc.          {Iron clay} (Min.), a yellowish clay containing a large             proportion of an ore of iron.          {Iron cross}, a Prussian order of military merit; also, the             decoration of the order.          {Iron crown}, a golden crown set with jewels, belonging             originally to the Lombard kings, and indicating the             dominion of Italy. It was so called from containing a             circle said to have been forged from one of the nails in             the cross of Christ.          {Iron flint} (Min.), an opaque, flintlike, ferruginous             variety of quartz.          {Iron founder}, a maker of iron castings.          {Iron foundry}, the place where iron castings are made.          {Iron furnace}, a furnace for reducing iron from the ore, or             for melting iron for castings, etc.; a forge; a             reverberatory; a bloomery.          {Iron glance} (Min.), hematite.          {Iron hat}, a headpiece of iron or steel, shaped like a hat             with a broad brim, and used as armor during the Middle             Ages.          {Iron horse}, a locomotive engine. [Colloq.]          {Iron liquor}, a solution of an iron salt, used as a mordant             by dyers.          {Iron man} (Cotton Manuf.), a name for the self-acting             spinning mule.          {Iron} {mold [or] mould}, a yellow spot on cloth stained by             rusty iron.          {Iron ore} (Min.), any native compound of iron from which the             metal may be profitably extracted. The principal ores are             magnetite, hematite, siderite, limonite, G[94]thite,             turgite, and the bog and clay iron ores.          {Iron pyrites} (Min.), common pyrites, or pyrite. See             {Pyrites}.          {Iron sand}, an iron ore in grains, usually the magnetic iron             ore, formerly used to sand paper after writing.          {Iron scale}, the thin film which on the surface of wrought             iron in the process of forging. It consists essentially of             the magnetic oxide of iron, {Fe3O4>}.          {Iron works}, a furnace where iron is smelted, or a forge,             rolling mill, or foundry, where it is made into heavy             work, such as shafting, rails, cannon, merchant bar, etc.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Pyrites \Py*ri"tes\, n. [L., fr. Gr. [?], fr. [?] fire. See       {Pyre}.] (Min.)       A name given to a number of metallic minerals, sulphides of       iron, copper, cobalt, nickel, and tin, of a white or       yellowish color.          Note: The term was originally applied to the mineral pyrite,                or iron pyrites, in allusion to its giving sparks when                struck with steel.          {Arsenical pyrites}, arsenopyrite.          {Auriferous pyrites}. See under {Auriferous}.          {Capillary pyrites}, millerite.          {Common pyrites}, isometric iron disulphide; pyrite.          {Hair pyrites}, millerite.          {Iron pyrites}. See {Pyrite}.          {Magnetic pyrites}, pyrrhotite.          {Tin pyrites}, stannite.          {White iron pyrites}, orthorhombic iron disulphide;             marcasite. This includes cockscomb pyrites (a variety of             marcasite, named in allusion to its form), spear pyrites,             etc.          {Yellow}, [or] {Copper}, {pyrites}, the sulphide of copper             and iron; chalcopyrite.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Ironbark tree \I"ron*bark` tree`\ (Bot.)       The Australian {Eucalyptus Sideroxylon}, used largely by       carpenters and shipbuilders; -- called also {ironwood}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Ironbound \I"ron*bound`\, a.       1. Bound as with iron; rugged; as, an ironbound coast.          2. Rigid; unyielding; as, ironbound traditions.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iron-fisted \I"ron-fist`ed\, a.       Closefisted; stingy; mean.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irremeable \Ir*re"me*a*ble\, a. [L. irremeabilis; pref. ir- not       + remeabilis returning, fr. remeare: cf. F. irr[82]m[82]able.       See {Remeant}.]       Admitting no return; as, an irremeable way. [Obs.] --Dryden.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irremobability \Ir`re*mob`a*bil"i*ty\, n.       The quality or state of being irremovable; immovableness.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irremovable \Ir`re*mov"a*ble\, a.       Not removable; immovable; inflexible. --Shak. --       {Ir`re*mov"a*bly}, adv.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irremovable \Ir`re*mov"a*ble\, a.       Not removable; immovable; inflexible. --Shak. --       {Ir`re*mov"a*bly}, adv.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irremoval \Ir`re*mov"al\, n.       Absence of removal.
From U.S. Gazetteer (1990) [gazetteer]:
Iron Belt, WI       Zip code(s): 54536
From U.S. Gazetteer (1990) [gazetteer]:
Irwinville, GA       Zip code(s): 31760
From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
iron box n.   [Unix/Internet] A special environment set up to    trap a {cracker} logging in over remote connections long enough to    be traced.   May include a modified {shell} restricting the cracker's    movements in unobvious ways, and `bait' files designed to keep him    interested and logged on.   See also {back door}, {firewall machine},    {Venus flytrap}, and Clifford Stoll's account in "{The Cuckoo's    Egg}" of how he made and used one (see the {Bibliography} in    Appendix C).   Compare {padded cell}.
From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
iron box          [Unix/Internet] A special environment set up to trap a       {cracker} logging in over remote connections long enough to be       traced.   May include a modified {shell} restricting the       cracker's movements in unobvious ways, and "bait" files       designed to keep him interested and logged on.   See also {back       door}, {firewall machine}, {Venus flytrap}, and Clifford       Stoll's account in "{The Cuckoo's Egg}" of how he made and       used one.   Compare {padded cell}.          [{Jargon File}]