‖Lis′sen‐ceph″a‐la (lĭs′sĕn‐sĕf″ȧ‐lȧ), n. pl. [NL., fr. Gr. λισσόσ smooth + εγκἔφαλοσ the brain.] (Zoöl.) A general name for all those placental mammals that have a brain with few or no cerebral convolutions, as Rodentia, Insectivora, etc.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.