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synapsid reptile

   Also found in: Wikipedia 0.05 sec.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.synapsid reptile - extinct reptile having a single pair of lateral temporal openings in the skull
synapsid
reptile, reptilian - any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms
protomammal, therapsid - probably warm-blooded; considered direct ancestor of mammals
ictodosaur - intermediate in form between the therapsids and most primitive true mammals
pelycosaur - large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America
edaphosaurus - heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic
dimetrodon - carnivorous dinosaur of the Permian in North America having a crest or dorsal sail


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