n.
Pronunciation: th ə - ' rap-s ə d
Function: noun
Etymology: New Latin Therapsida, from ther- mammal (fr. Greek th ē r wild animal) + apsid-, apsis arch, vault ― more at FIERCE , APSIS
Date: 1912
: any of an order (Therapsida) of Permian and Triassic syrapsid reptiles considered ancestors of the mammals
– therapsid adjective