'Lyencephala' definitions:

Definition of 'Lyencephala'

From: GCIDE

Lyencephala \Ly`en*ceph"a*la\, n. pl. [NL., fr. Gr. ? to loose + ? the brain.] (Zool.) A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary. [1913 Webster]