DAILY UPDATED VOCABULARY WITH PICTURES. BRAIN.

• brain
• 1

  organ

   [countable] the organ inside your head that controls how you think, feel, and move:
• Messages from the brain are carried by the central nervous system.
• the chemistry of the brain
• the human brain
• the right/left hemisphere of the brain (=the right or left side of the brain)
• Emotional responses are a function of the right hemisphere of the brain.
• She died of a brain tumour.
• brain tissue/cell
• 2

  intelligence

   [countable usually plural, uncountable] the ability to think clearly and learn quickly:
• If you had any brains, you'd know what I meant.
• The job requires brains.
• Something's addled your brains (=made you confused).
• Come on, use your brain, John.
• 3

  person

   [countable usually plural] informal someone who is intelligent, with good ideas and useful skills:
• Some of our best brains are leaving the country to work in the US.
• ➔ brain drain
• 4

  food

   [uncountable] also brains [plural] the brain of an animal, used as food
• 5

   have something on the brain

  informal to be always thinking about something:
• I've got that song on the brain today.
• 6

   be the brains behind/of something

  to be the person who thought of and developed a particular plan, system, or organization, especially a successful one:
• Danny's definitely the brains of the project.
• 7

   brain dead

• a) in a state where your brain has stopped working properly even though your heart may still be beating
• b) informal in a state in which you seem stupid or uninteresting, especially because you live a boring life or are very tired
• 8

   brain box

  British English informal a very intelligent person
• ➔ bird-brain, hare-brained

   ; ➔ beat your brains out

   at beat1 (22)

   ; ➔ pick somebody's brains

   at pick1 (7)

   ; ➔ rack your brain(s)

   at rack2(2)

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.