noun
The organ of intelligence
pons, cerebrum, cerebellum, medulla oblongata; encephalon, center of the nervous system, gray matter, cerebral matter, cortical substance, medullary substance, brain cells.
The intelligence; often plural
intellect, understanding, mental ability; see genius 1, head 1, mind 1.
*A very intelligent person
genius, intellectual, scholar, mastermind; see genius 2, intellectual.
have on the brain
be obsessed with, be preoccupied by, think about obsessively, be fixated on; see haunt 3, occupy 3.