|  | 
Definition of Lyencephala
1. n. pl. A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary.
Medical Definition of Lyencephala
1. 
|  | 
1. n. pl. A group of Mammalia, including the marsupials and monotremes; -- so called because the corpus callosum is rudimentary.
1.