[fawr-breyn, fohr-]

noun Anatomy.

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.
the telencephalon.

Origin of forebrain

First recorded in 1875–80; fore- + brain Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for forebrain

Historical Examples of forebrain

  • Autopsies on imbeciles show an infantile development of the forebrain.

  • The molecules mingle with the molecules of serum: In seconds they are washed against the cell-walls of the forebrain.

    The Syndic

    C.M. Kornbluth

  • He jerked his mind away suddenly from the thoughts which had crowded into his forebrain.

    Cum Grano Salis

    Gordon Randall Garrett

British Dictionary definitions for forebrain



the nontechnical name for prosencephalon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for forebrain




The prosencephalon.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for forebrain



The forwardmost part of the vertebrate brain. In humans, it consists of the thalamus, the hypothalamus, and the cerebrum. Compare hindbrain midbrain.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.