synapsid
English Thesaurus
1. extinct reptile having a single pair of lateral temporal openings in the skull (noun.animal)
| hypernym | : | reptile, reptilian, |
| definition | : | any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms (noun.animal) |
| hyponym | : | protomammal, therapsid, |
| definition | : | probably warm-blooded; considered direct ancestor of mammals (noun.animal) |
| hyponym | : | ictodosaur, |
| definition | : | intermediate in form between the therapsids and most primitive true mammals (noun.animal) |
| hyponym | : | pelycosaur, |
| definition | : | large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America (noun.animal) |
| hyponym | : | edaphosaurus, |
| definition | : | heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic (noun.animal) |
| hyponym | : | dimetrodon, |
| definition | : | carnivorous dinosaur of the Permian in North America having a crest or dorsal sail (noun.animal) |
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