the·rap·sid 
(thə-răpsĭd)
(thə-răpsĭd)n.
Any of various amniote vertebrates that emerged in the Permian Period and diversified in the Triassic, including the mammals, their ancestors, and their relatives.
[From New Latin Thērapsida, order name : Greek thēr, wild animal; see THEROPOD + Greek hapsis, hapsid-, arch, vault (from the enlarged lower temporal opening characteristic of the group); see APSIS.]
the·rapsid adj.
- comprisable
- comprise
- compromise
- compromiser
- compsognathus
- comp time
- Compton
- Compton
- Compton effect
- comptroller
- compulsion
- compulsive
- compulsively
- compulsiveness
- compulsivity
- compulsorily
- compulsoriness
- compulsory
- compunction
- compunctious
- compunctiously
- compurgation
- computability
- computable
- computation