ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  order Pelycosauria - edaphosaurus; dimetrodon animal order - the order of animals subclass Synapsida, Synapsida - extinct reptiles of the Permian to Jurassic considered ancestral to mammals pelycosaur - large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America Edaphosauridae, family Edaphosauridae - a family of reptiles of the order Pelycosauria genus Dimetrodon - a reptile genus of Pelycosauria |
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