Anapsida
plural noun
An·ap·si·da
-sədə
: a subclass of Reptilia comprising primitive forms in which the skull lacks temporal openings and including chiefly Permian forms with the turtles as its only present representatives
Word History
Etymology
New Latin, from an- + -apsida (from Greek apsid-, apsis loop, arch)
First Known Use
1917, in the meaning defined above