| NOUN | animal | synapsid reptile, synapsid | extinct reptile having a single pair of lateral temporal openings in the skull |
|---|
| Meaning | Extinct reptile having a single pair of lateral temporal openings in the skull. | |
|---|---|---|
| Synonym | synapsid | |
| Narrower | dimetrodon | carnivorous dinosaur of the Permian in North America having a crest or dorsal sail |
| edaphosaurus | Heavy-bodied reptile with a dorsal sail or crest | |
| ictodosaur | Intermediate in form between the therapsids and most primitive true mammals | |
| pelycosaur | large primitive reptile having a tall spinal sail | |
| therapsid, protomammal | probably warm-blooded | |
| Broader | reptile, reptilian | Any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms |
| Spanish | sinápsido | |
| Catalan | sinàpsid | |
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