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brain

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noun brain pronunciation in American English /breɪn/ 
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singularbrain
pluralbrains
  1. 1
    [countable] the organ inside your head that allows you to think and feel, and controls your body

    The human brain is divided into two halves.

    1. a.
      [only before noun] belonging to or connected with the brain

      a brain tumor/scan/operation

      brain activity/function

    2. b.

      brains

      [plural] the brain of an animal cooked and eaten as food
      Synonyms and related words for this sense of brain
  2. 2
    [countable] [often plural] mental ability or intelligence

    You have to use your brains in this job.

    have brains/a brain (=be intelligent):

    He's good-looking, and he has brains.

    1. a.
      [countable] an intelligent person

      The best brains in the country have failed to solve this problem.

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