[ dahy-en-sef-uh-lon ]
/ ˌdaɪ ɛnˈsɛf əˌlɒn /

noun, plural di·en·ceph·a·lons, di·en·ceph·a·la [dahy-en-sef-uh-luh] /ˌdaɪ ɛnˈsɛf ə lə/. Anatomy.

the posterior section of the forebrain.

Origin of diencephalon

From New Latin, dating back to 1880–85; see origin at di-3, encephalon

Related forms

di·en·ce·phal·ic [dahy-en-suh-fal-ik] /ˌdaɪ ɛn səˈfæl ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for diencephalon


/ (ˌdaɪɛnˈsɛfəˌlɒn) /


the part of the brain that includes the basal ganglia, thalamus, hypothalamus, and associated areas

Derived Forms

diencephalic (ˌdaɪɛnsɪˈfælɪk), adjective
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 diencephalon


[ dī′ĕn-sĕfə-lŏn′, -lən ]


The posterior part of the prosencephalon, composed of the epithalamus, the dorsal thalamus, the subthalamus, and the hypothalamus.betweenbrain interbrain
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.