Brain Definition

brān
brained, brains
noun
brains
The mass of nerve tissue in the cranium of vertebrate animals, an enlarged extension of the spinal cord: it is the main part of the nervous system, the center of thought, and the organ that perceives sensory impulses and regulates motor impulses: it is made up of gray matter (the outer cortex of nerve cells) and white matter (the inner mass of nerve fibers)
Webster's New World
A comparable organ in invertebrate animals.
Webster's New World
Intellectual ability; intellect.
An actor not known for his quick brain.
American Heritage
Intelligence; mental ability.
Webster's New World
A person of great intelligence.
Webster's New World
verb
brained, brains
To dash out the brains of.
Webster's New World
To hit hard on the head.
Webster's New World

(figuratively) To destroy; to put an end to.

Wiktionary

To conceive in the mind; to understand.

Wiktionary
idiom
beat (one's) brains (out)
  • To exert or expend great mental effort:

    She beat her brains out during the examination.

American Heritage
on the brain
  • Obsessively in mind:

    The coach has winning on the brain.

American Heritage
pick (someone's) brain
  • To explore another's ideas through questioning.
American Heritage
rack (one's) brain
  • To think long and hard:

    I racked my brain for hours trying to recall her name.

American Heritage
have on the brain
  • to be obsessed by
Webster's New World

Other Word Forms of Brain

Noun

Singular:
brain
Plural:
brains

Idioms, Phrasal Verbs Related to Brain

Origin of Brain

  • From Middle English brain, from Old English bræġen (“brain”), from Proto-Germanic *bragną (“brain”), from Proto-Indo-European *mreghmno-, *mreghmo- (“skull, brain”), from Proto-Indo-European *mreK- (“marrow, sinciput”). Cognate with Scots braine, brane (“brain”), North Frisian brayen, brein (“brain”), West Frisian brein (“brain”), Dutch brein (“brain”), Low German Brägen (“brain”), Bregen Ancient Greek βρεχμός (brechmos, “front part of the skull, top of the head”).

    From Wiktionary

  • Middle English from Old English brægen

    From American Heritage Dictionary of the English Language, 5th Edition

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