iridium
         n 1: a heavy brittle metallic element of the platinum group;
               used in alloys; occurs in natural alloys with platinum or
               osmium [syn: {iridium}, {Ir}, {atomic number 77}]

English Dictionary: irredeemable	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
iridoncus n swelling of the iris of the eye
From WordNet (r) 3.0 (2006) [wn]:
irrational adj not consistent with or using reason; "irrational fears"; "irrational animals" Antonym(s): rational real but not expressible as the quotient of two integers; "irrational numbers" Antonym(s): rational n a real number that cannot be expressed as a rational number Synonym(s): irrational number, irrational
From WordNet (r) 3.0 (2006) [wn]:
irrational hostility n extreme prejudice
From WordNet (r) 3.0 (2006) [wn]:
irrational impulse n a strong spontaneous and irrational motivation; "his first impulse was to denounce them"; "the urge to find out got him into trouble"
From WordNet (r) 3.0 (2006) [wn]:
irrational motive n a motivation that is inconsistent with reason or logic
From WordNet (r) 3.0 (2006) [wn]:
irrational number n a real number that cannot be expressed as a rational number Synonym(s): irrational number, irrational
From WordNet (r) 3.0 (2006) [wn]:
irrationality n the state of being irrational; lacking powers of understanding Synonym(s): irrationality, unreason
From WordNet (r) 3.0 (2006) [wn]:
irrationally adv in an irrational manner; "they acted irrationally" [ant: rationally]
From WordNet (r) 3.0 (2006) [wn]:
irredeemable adj insusceptible of reform; "vicious irreclaimable boys"; "irredeemable sinners" Synonym(s): irreclaimable, irredeemable, unredeemable, unreformable (of paper money) not convertible into coin at the pleasure of the holder
From WordNet (r) 3.0 (2006) [wn]:
irredenta n a region that is related ethnically or historically to one country but is controlled politically by another Synonym(s): irredenta, irridenta
From WordNet (r) 3.0 (2006) [wn]:
irredentism n the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related Synonym(s): irredentism, irridentism
From WordNet (r) 3.0 (2006) [wn]:
irredentist n an advocate of irredentism [syn: irredentist, irridentist]
From WordNet (r) 3.0 (2006) [wn]:
irridenta n a region that is related ethnically or historically to one country but is controlled politically by another Synonym(s): irredenta, irridenta
From WordNet (r) 3.0 (2006) [wn]:
irridentism n the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related Synonym(s): irredentism, irridentism
From WordNet (r) 3.0 (2006) [wn]:
irridentist n an advocate of irredentism [syn: irredentist, irridentist]
From WordNet (r) 3.0 (2006) [wn]:
irritant n something that causes irritation and annoyance; "he's a thorn in my flesh" Synonym(s): irritant, thorn
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iridian \I*rid"i*an\, a.       Of or pertaining to the iris or rainbow.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Iridium \I*rid"i*um\, n. [NL., fr. L. iris, iridis, the rainbow.       So called from the iridescence of some of its solutions. See       {Iris}.] (Chem.)       A rare metallic element, of the same group as platinum, which       it much resembles, being silver-white, but harder, and       brittle, and indifferent to most corrosive agents. With the       exception of osmium, it is the heaviest substance known, its       specific gravity being 22.4. Symbol Ir. Atomic weight 192.5.          Note: Iridium usually occurs as a native alloy with osmium                (iridosmine or osmiridium), which may occur alone or                with platinum. Iridium, as an alloy with platinum, is                used in bushing the vents of heavy ordnance. It is also                used for the points of gold pens, and in a finely                powdered condition (iridium black), for painting                porcelain black.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irradiance \Ir*ra"di*ance\, Irradiancy \Ir*ra"di*an*cy\, n.       [From {Irradiant}.]       1. The act of irradiating; emission of rays of light.          2. That which irradiates or is irradiated; luster; splendor;             irradiation; brilliancy. --Milton.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irradiance \Ir*ra"di*ance\, Irradiancy \Ir*ra"di*an*cy\, n.       [From {Irradiant}.]       1. The act of irradiating; emission of rays of light.          2. That which irradiates or is irradiated; luster; splendor;             irradiation; brilliancy. --Milton.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irradiant \Ir*ra"di*ant\, a. [L. irradians, -antis, p. pr. See       {Irradiate}.]       Irradiating or illuminating; as, the irradiant moon. --Boyse.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irrational \Ir*ra"tion*al\, a. [L. irrationalis: cf. F.       irrationnel. See {In-} not, and {Rational}.]       1. Not rational; void of reason or understanding; as, brutes             are irrational animals.          2. Not according to reason; absurd; foolish.                         It seemed utterly irrational any longer to maintain                      it.                                                   --I. Taylor.          3. (Math.) Not capable of being exactly expressed by an             integral number, or by a vulgar fraction; surd; -- said             especially of roots. See {Surd}.          Syn: Absurd; foolish; preposterous; unreasonable; senseless.                See {Absurd}.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irrationality \Ir*ra`tion*al"i*ty\, n.       The quality or state of being irrational. [bd]Brutish       irrationaliity.[b8] --South.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irrationally \Ir*ra"tion*al*ly\, adv.       In an irrational manner. --Boyle.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irrationalness \Ir*ra"tion*al*ness\, n.       Irrationality.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irredeemability \Ir`re*deem`a*bil"i*ty\, n.       The state or quality of being irredeemable; irredeemableness.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irredeemable \Ir`re*deem"a*ble\, a.       Not redeemable; that can not be redeemed; not payable in gold       or silver, as a bond; -- used especially of such government       notes, issued as currency, as are not convertible into coin       at the pleasure of the holder. -- {Ir`re*deem"a*ble*ness},       adv.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irredeemable \Ir`re*deem"a*ble\, a.       Not redeemable; that can not be redeemed; not payable in gold       or silver, as a bond; -- used especially of such government       notes, issued as currency, as are not convertible into coin       at the pleasure of the holder. -- {Ir`re*deem"a*ble*ness},       adv.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irretention \Ir`re*ten"tion\, n.       Want of retaining power; forgetfulness. --De Quincey.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irretentive \Ir`re*ten"tive\, a.       Not retentive; as, an irretentive memory.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irritancy \Ir"ri*tan*cy\, n. [From 2d {Irritant}.]       The state o quality of being irritant or irritating.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irritancy \Ir"ri*tan*cy\, n. [From 1st {Irritant}.] (Scots Law)       The state or quality of being null and void; invalidity;       forfeiture. --Burrill.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irritant \Ir"ri*tant\, a. [LL. irritants, -antis, p. pr. of       irritare to make null, fr. L. irritus void; pref. ir- not +       ratus established.] (Scots Law)       Rendering null and void; conditionally invalidating.                   The states elected Harry, Duke of Anjou, for their                king, with this clause irritant; that, if he did                violate any part of his oath, the people should owe him                no allegiance.                                       --Hayward.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irritant \Ir"ri*tant\, a. [L. irritans, -antis, p. pr. of       irritare: cf. F. irritant. See {Irritate} to excite.]       Irritating; producing irritation or inflammation.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Irritant \Ir"ri*tant\, n. [Cf. F. irritant.]       1. That which irritates or excites.          2. (Physiol. & Med.) Any agent by which irritation is             produced; as, a chemical irritant; a mechanical or             electrical irritant.          3. (Toxicology) A poison that produces inflammation.          {Counter irritant}. See under {Counter}.          {Pure irritant} (Toxicology), a poison that produces             inflammation without any corrosive action upon the             tissues.
From U.S. Gazetteer (1990) [gazetteer]:
Ireton, IA (city, FIPS 38820)       Location: 42.97529 N, 96.32154 W       Population (1990): 597 (229 housing units)       Area: 2.6 sq km (land), 0.0 sq km (water)       Zip code(s): 51027
From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
irrational number          A {real number} which is not a {rational       number}, i.e. it is not the ratio of two {integer}s.          The decimal expansion of an irrational is infinite but does       not end in an infinite repeating sequence of digits.          Examples of irrational numbers are {pi}, {e} and the square       root of two.          (1995-04-12)
From The Elements (22Oct97) [elements]:
iridium    Symbol: Ir    Atomic number: 77    Atomic weight: 192.217    Very hard and brittle, silvery metallic transition element. It has a    yellowish cast to it. Salts of iridium are highly colored. It is the    most corrosion resistant metal known, not attacked by any acid, but is    attacked by molten salts. There are two natural isotopes of iridium, and    4 radioisotopes, the most stable being Ir-192 with a half-life of 73.83    days. Ir-192 decays into {platinum}, while the other radioisotopes decay    into {osmium}. Iridium is used in high temperature apparatus, electrical    contacts, and as a hardening agent for platinum. Discovered in 1803 by    Smithson Tennant in England. The name comes from the Greek word iris, which    means rainbow. Iridium metal is generally non-toxic due to its relative    unreactivity, but iridium compounds should be considered highly toxic.