Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun synapsid

1 sense of synapsid

Sense 1
synapsid, synapsid reptile -- (extinct reptile having a single pair of lateral temporal openings in the skull)
       => reptile, reptilian -- (any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms)