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English Dictionary: brain by the DICT Development Group
3 results for brain
From WordNet (r) 3.0 (2006) [wn]:
brain
n
  1. that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord
    Synonym(s): brain, encephalon
  2. mental ability; "he's got plenty of brains but no common sense"
    Synonym(s): brain, brainpower, learning ability, mental capacity, mentality, wit
  3. that which is responsible for one's thoughts and feelings; the seat of the faculty of reason; "his mind wandered"; "I couldn't get his words out of my head"
    Synonym(s): mind, head, brain, psyche, nous
  4. someone who has exceptional intellectual ability and originality; "Mozart was a child genius"; "he's smart but he's no Einstein"
    Synonym(s): genius, mastermind, brain, brainiac, Einstein
  5. the brain of certain animals used as meat
v
  1. hit on the head
  2. kill by smashing someone's skull
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Brain \Brain\, n. [OE. brain, brein, AS. bragen, br[91]gen; akin
      to LG. br[84]gen, bregen, D. brein, and perh. to Gr. [?], the
      upper part of head, if [?] =[?]. [root]95.]
      1. (Anat.) The whitish mass of soft matter (the center of the
            nervous system, and the seat of consciousness and
            volition) which is inclosed in the cartilaginous or bony
            cranium of vertebrate animals. It is simply the anterior
            termination of the spinal cord, and is developed from
            three embryonic vesicles, whose cavities are connected
            with the central canal of the cord; the cavities of the
            vesicles become the central cavities, or ventricles, and
            the walls thicken unequally and become the three segments,
            the fore-, mid-, and hind-brain.
  
      Note: In the brain of man the cerebral lobes, or largest part
               of the forebrain, are enormously developed so as to
               overhang the cerebellum, the great lobe of the
               hindbrain, and completely cover the lobes of the
               midbrain. The surface of the cerebrum is divided into
               irregular ridges, or convolutions, separated by grooves
               (the so-called fissures and sulci), and the two
               hemispheres are connected at the bottom of the
               longitudinal fissure by a great transverse band of
               nervous matter, the corpus callosum, while the two
               halves of the cerebellum are connected on the under
               side of the brain by the bridge, or pons Varolii.
  
      2. (Zo[94]l.) The anterior or cephalic ganglion in insects
            and other invertebrates.
  
      3. The organ or seat of intellect; hence, the understanding.
            [bd] My brain is too dull.[b8] --Sir W. Scott.
  
      Note: In this sense, often used in the plural.
  
      4. The affections; fancy; imagination. [R.] --Shak.
  
      {To have on the brain}, to have constantly in one's thoughts,
            as a sort of monomania. [Low]
  
      {Brain box} [or] {case}, the bony on cartilaginous case
            inclosing the brain.
  
      {Brain coral}, {Brain stone coral} (Zo[94]l), a massive
            reef-building coral having the surface covered by ridges
            separated by furrows so as to resemble somewhat the
            surface of the brain, esp. such corals of the genera
            {M[91]andrina} and {Diploria}.
  
      {Brain fag} (Med.), brain weariness. See {Cerebropathy}.
  
      {Brain fever} (Med.), fever in which the brain is specially
            affected; any acute cerebral affection attended by fever.
           
  
      {Brain sand}, calcareous matter found in the pineal gland.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Brain \Brain\, v. t. [imp. & p. p. {Brained}; p. pr. & vb. n.
      {Braining}.]
      1. To dash out the brains of; to kill by beating out the
            brains. Hence, Fig.: To destroy; to put an end to; to
            defeat.
  
                     There thou mayst brain him.               --Shak.
  
                     It was the swift celerity of the death . . . That
                     brained my purpose.                           --Shak.
  
      2. To conceive; to understand. [Obs.]
  
                     [?]T is still a dream, or else such stuff as madmen
                     Tongue, and brain not.                        --Shak.
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