Used other than figuratively or idiomatically: see brain, damage. / (figuratively) stupidity

Exhibiting low intelligence, as if having only half a brain.

(colloquial, humorous) A fictitious substance that is used to "clean" disturbing images from the mind.

plural of 'twixt-brain

(anatomy, dated) The thalamencephalon.

Alternative form of brain bucket

(idiomatic, sometimes humorous) A protective helmet, as worn, for example, by a motorcyclist, bicyclist, or soldier in combat. / (dated) The skull.

(idiomatic) A narrative, commentary, etc. which amuses and holds one's attention, but which lacks intellectual depth or importance.

Alternative form of birdbrain

Alternative form of birdbrained