No-brainer

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Brain \Brain\ (br[=a]n), n. [OE. brain, brein, AS. bragen,
     br[ae]gen; akin to LG. br[aum]gen, bregen, D. brein, and
     perh. to Gr. bre`gma, brechmo`s, the upper part of head, if
     [beta] = [phi]. [root]95.]
     [1913 Webster]
     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.
        [1913 Webster]
  
     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.
           [1913 Webster]
  
     2. (Zool.) The anterior or cephalic ganglion in insects and
        other invertebrates.
        [1913 Webster]
  
     3. The organ or seat of intellect; hence, the understanding;
        as, use your brains. " My brain is too dull." --Sir W.
        Scott.
        [1913 Webster]
  
     Note: In this sense, often used in the plural.
           [1913 Webster]
  
     4. The affections; fancy; imagination. [R.] --Shak.
        [1913 Webster]
  
     5. a very intelligent person. [informal]
        [PJC]
  
     6. the controlling electronic mechanism for a robot, guided
        missile, computer, or other device exhibiting some degree
        of self-regulation. [informal]
        [PJC]
  
     {To have on the brain}, to have constantly in one's thoughts,
        as a sort of monomania. [Low]
  
     {no-brainer} a decision requiring little or no thought; an
        obvious choice. [slang]
        [1913 Webster]
  
     {Brain box} or {Brain case}, the bony or cartilaginous case
        inclosing the brain.
  
     {Brain coral}, {Brain stone coral} (Zool.), 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[ae]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.
        [1913 Webster]

From WordNet (r) 2.0 [wn]:

  no-brainer
       n : anything that requires little thought