Etymology
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brain (n.)

"soft, grayish mass filling the cranial cavity of a vertebrate," in the broadest sense, "organ of consciousness and the mind," Old English brægen "brain," from Proto-Germanic *bragnan (source also of Middle Low German bregen, Old Frisian and Dutch brein), of uncertain origin, perhaps from PIE root *mregh-m(n)o- "skull, brain" (source also of Greek brekhmos "front part of the skull, top of the head"). But Liberman writes that brain "has no established cognates outside West Germanic" and is not connected to the Greek word. More probably, he writes, its etymon is PIE *bhragno "something broken."

The custom of using the plural to refer to the substance (literal or figurative), as opposed to the organ, dates from 16c. Figurative sense of "intellectual power" is from late 14c.; meaning "a clever person" is first recorded 1914. To have something on the brain "be extremely eager for or interested in" is from 1862. Brain-fart "sudden loss of memory or train of thought; sudden inability to think logically" is by 1991 (brain-squirt is from 1650s as "feeble or abortive attempt at reasoning"). An Old English word for "head" was brægnloca, which might be translated as "brain locker." In Middle English, brainsick (Old English brægenseoc) meant "mad, addled."

brain (v.)

"to dash the brains out," late 14c., from brain (n.). Related: Brained; braining.

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Definitions of brain
1
brain (n.)
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
brain (n.)
mental ability;
he's got plenty of brains but no common sense
Synonyms: brainpower / learning ability / mental capacity / mentality / wit
brain (n.)
that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason;
Synonyms: mind / head / psyche / nous
brain (n.)
someone who has exceptional intellectual ability and originality;
Synonyms: genius / mastermind / brainiac / Einstein
brain (n.)
the brain of certain animals used as meat;
2
brain (v.)
hit on the head;
brain (v.)
kill by smashing someone's skull;
From wordnet.princeton.edu