a. Zool. [f. mod.L. Lissencephal-a (f. λισσός smooth + ἐγκέφαλος brain) + -OUS.] Pertaining to the Lissencephala, the second group of mammals in Owen’s classification, which have smooth brains.
1859. Owen, Class. Mammalia, 33. The following Table exemplifies the correspondence of the groups in the Lyencephalous and Lissencephalous series.
1875. Blake, Zool., 53. The lissencephalous or smooth-brained mammals fall naturally into four well-defined orders.
