Any of many rhythmic fluctuations of electric potential between parts of the brain, especially those seen on an electroencephalogram / A sudden idea, understanding, or inspiration; a brainstorm

(informal) A difficult problem or puzzle.

plural of brainchild

The characteristic of being brainy.

The part of the skull that contains the brain; the neurocranium.

plural of braincase

Alternative spelling of brain-dead

plural of brainbuster

(music) Synonym of intelligent dance music

(now chiefly Canada, US, colloquial) The skull. / (now chiefly Canada, US, colloquial) The brain or mind.