#1 brain n. [encephalon] that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord. wn
#2 brain n. [brainpower, learning ability, mental capacity, mentality, wit] mental ability; "he's got plenty of brains but no common sense". wn
#3 brain n. [mind, head, psyche, nous] 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". wn
#4 brain n. [genius, mastermind, brainiac, Einstein] someone who has exceptional intellectual ability and originality; "Mozart was a child genius"; "he's smart but he's no Einstein". wn
#5 brain v. hit on the head. wn
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