Brain

n.	1.
	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.
	2.	(Zool.) The anterior or cephalic ganglion in insects and other invertebrates.
	3.	The organ or seat of intellect; hence, the understanding; as, use your brains.
	4.	The affections; fancy; imagination.
	5.	a very intelligent person.
	6.	the controlling electronic mechanism for a robot, guided missile, computer, or other device exhibiting some degree of self-regulation. To have on the brain to have constantly in one's thoughts, as a sort of monomania. no-brainer a decision requiring little or no thought; an obvious choice. Brain box the bony or cartilaginous case inclosing the brain. Brain 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 Mæandrina 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.
v. t.	1.	To dash out the brains of; to kill by beating out the brains. There thou mayst brain him. - Shak. It was the swift celerity of the death . . . That brained my purpose. - Shak.
	2.	To conceive; to understand. 'T is still a dream, or else such stuff as madmen Tongue, and brain not. - Shak.

Noun	1.	brain - that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord Synonyms: encephalon
	2.	brain - mental ability; "he's got plenty of brains but no common sense" Synonyms: brainpower, learning ability, mental capacity, mentality, wit
	3.	brain - 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" Synonyms: mind, psyche, nous, head
	4.	brain - someone who has exceptional intellectual ability and originality; "Mozart was a child genius"; "he's smart but he's no Einstein" Synonyms: genius, mastermind, Einstein
	5.	brain - the brain of certain animals used as meat
Verb	1.	brain - hit on the head
	2.	brain - kill by smashing someone's skull

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