Pronunciation: (fôr'brān", fōr'-), [key]
1. Also called prosencephalon. the 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.
2. the telencephalon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.