brain teaser

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Also see: teaser

Concise Oxford English Dictionary © 2008 Oxford University Press:
brain/breɪn/

▶noun

• 1 an organ of soft nervous tissue contained in the skull, functioning as the coordinating centre of sensation and intellectual and nervous activity.

  ■ (brains) the substance of an animal's brain used as food.

• 2 intellectual capacity.

• 3 (the brains) informal a clever person who is the main organizer within a group.

▶verb informal hit hard on the head with an object.

– phrases
have something on the brain informal be obsessed with something.

– derivatives
-brained adjective.

– origin OE brægen, of W. Gmc origin.