/ Dictionary / Index F forebrain: Meaning and Definition of Find definitions for: fore•brain Pronunciation: (fôr'brān", fōr'-), [key] — n. Anat. Also calledthe anterior of the three primary divisions of the brain in the embryo of a vertebrate, or the part of the adult brain derived from this tissue including the diencephalon and telencephalon. the telencephalon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: forebrain (Thesaurus) forebody forecaddie Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language