Meaning of “brain” in the English Dictionary

"brain" in British English

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brainnoun

uk /breɪn/ us /breɪn/

A2 [ C ] the organ inside the head that controls thought, memory, feelings, and activity:

Doctors tried desperately to reduce the swelling in her brain.
The accident left him with permanent brain damage.
His wife died from a brain tumour.

C1 [ C ] used to refer to intelligence:

Marie has an amazing brain (= is very intelligent).
That can't possibly be the right way to do it - use your brain!
The poor child inherited his mother's brains and his father's looks.
He's got brains but he's too lazy to use them (= he is intelligent but lazy).

[ C usually plural ] informal a very intelligent person, especially one who has spent a lot of time studying:

We have the best brains in the land working on this problem.
the brains [ S ]

the most intelligent person in a group, especially the person who plans what the group will do:

My little brother's the brains of the family.

More examples

brainverb [ T ]

uk /breɪn/ us /breɪn/ informal

(Definition of “brain” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"brain" in American English

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brainnoun [ C ]

us /breɪn/

the organ inside the head that controls thought, memory, feelings, and physical activity:

a brain tumor
brain surgery
They found fractured ribs, other bone injuries, and brain damage.

infml A brain is also a very intelligent person:

We’ve got the best brains in the country working on this problem.

(Definition of “brain” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"brain" in Business English

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brainnoun

uk /breɪn/ us informal

[ C, usually plural ] a very intelligent person:

We've got the best brains in the industry working on the cars.
the brains [ S ]

the person responsible for the planning and management of an activity or organization:

the brains behind sth He is the brains behind the corporation's success.

(Definition of “brain” from the Cambridge Business English Dictionary © Cambridge University Press)