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WordReference Random House Learner's Dictionary of American English © 2024brain /breɪn/USA pronunciation n. [countable]- Anatomy, Zoologythe mass of nerve tissue in the head of humans and animals that is the center of the nervous system.
- Sometimes, brains. understanding;
intellectual power;
intelligence:He has a good brain for math. She sometimes acts as if she has no brains. - Slang Terms brains, Slang. [the + ~; used with a singular verb] a member of a group who is regarded as having the intelligence necessary to lead:Who was the brains behind this evil plot?
- Informal TermsInformal. an extremely intelligent person:She's a real brain in chemistry.
v. [~ + object] - Slang TermsSlang. to hit or bang on the head:What are you doing, braining your little brother?
Idioms- Informal Terms, Idioms beat or rack one's brains (out), [no object] Informal. to try very hard to work out a problem, remember something, etc.:beat her brains out trying to come up with a fair solution.
- beat someone's brains out, [no object] to injure by hitting or beating very hard, as by hitting on the head:She leaped on top of him and beat his brains out.
- Idioms pick someone's brains, to obtain information by questioning another person:didn't prepare for the exam but counted on picking his roommate's brains.
WordReference Random House Unabridged Dictionary of American English © 2024brain (brān),USA pronunciation n. - Anatomy, Zoologythe part of the central nervous system enclosed in the cranium of humans and other vertebrates, consisting of a soft, convoluted mass of gray and white matter and serving to control and coordinate the mental and physical actions.
- Zoology(in many invertebrates) a part of the nervous system more or less corresponding to the brain of vertebrates.
- Sometimes, brains. (used with a pl. v.) understanding;
intellectual power;
intelligence. - the brain as the center of thought, understanding, etc.;
mind;
intellect. - Slang Terms brains, a member of a group who is regarded as its intellectual leader or planner:The junior partner is the brains of the firm.
- Informal Termsa very intelligent or brilliant person.
- Computing, Informal Terms[Informal.]
- the controlling or guiding mechanism in a computer, robot, pacemaker, etc.
- the part of a computer system for coordination or guidance, as of a missile.
- Informal Terms beat one's brains out, to try very hard to understand and work out a problem, remember something, etc.:She beat her brains out studying for the exam.
- Idioms have something on the brain, to have an obsession;
be occupied with:Lately I seem to have food on the brain. - Idioms pick someone's brains, to obtain information by questioning another person rather than by seeking it independently:He refused to prepare for the exam but counted on being able to pick his roommate's brains.
v.t. - to smash the skull of.
- Slang Termsto hit or bang (someone) on the head.
- bef. 1000; Middle English; Old English bræg(e)n, bregen; cognate with Low German brägen, Dutch brein
- 3.See corresponding entry in Unabridged sense; capacity. See mind.
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