'Diencephalon' definitions:

Definition of 'diencephalon'

From: WordNet
noun
The posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon [syn: diencephalon, interbrain, betweenbrain, thalmencephalon]

Definition of 'Diencephalon'

From: GCIDE
  • Diencephalon \Di`en*ceph"a*lon\, n. [NL. See Dia-, and Encephalon.] (Anat.) The interbrain or thalamencephalon; -- sometimes abbreviated to dien. See Thalamencephalon. [1913 Webster]