(medicine, not comparable) Having an irreversible loss of brain function and cessation of brain activity. / (colloquial) Having no useful thoughts; stupid; ditzy.

(colloquial) Idiotic

Muddled in thought or mind; foolish; stupid.

(colloquial) cerebrospinal fluid

(anatomy, psychology) The most primitive part of the brain; the brain stem. / (by extension) Any part of a person's psyche or personality dominated by instinct or impulse rather than rational thought.

A forensic technique that uses electroencephalography to determine whether specific information is stored in a subject's brain.

plural of brain surgery

(anatomy, psychology) The primitive part of the human brain that mirrors that of reptiles, controlling instinctive behavior.

(informal) A sensation akin to an electric shock in the brain, associated with the discontinuation of treatment with antidepressants.

plural of brain zap