plural noun
Lis·​sen·​ceph·​a·​la | \ˌli(ˌ)senˈsefələ, sə̇n-, -₋sᵊn-\

Definition of Lissencephala 

in some classifications

: eutherian mammals having a brain with few or no cerebral convolutions and including the edentates, bats, insectivores, and rodents

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History and Etymology for Lissencephala

New Latin, from liss- + -encephala (from Greek enkephalos brain)

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to make faulty or ineffective

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