/ Dictionary / Index I interbrain: Meaning and Definition of Find definitions for: in•ter•brain Pronunciation: (in'tur-brān"), [key] — n. the diencephalon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: interbrain (Thesaurus) interborough interbreed Related Content Daily Word Quiz: ingenuity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language