Diencephalon
Pronunciation : Di`en*ceph"a*lon
Part of Speech : n.
Etymology : [NL. See Dia-, and Encephalon.] (Anat.)
Definition : Defn: The interbrain or thalamencephalon; -- sometimes abbreviated to dien. See Thalamencephalon.
Source : Webster's Unabridged Dictionary, 1913