Meaning of brain
Definition of brain
(noun)
that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord
that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason; "his mind wandered"; "I couldn't get his words out of my head"
someone who has exceptional intellectual ability and originality; "Mozart was a child genius"; "he's smart but he's no Einstein"
(verb)
hit on the head