noun🔗SharePélycosaurienAny of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria."While not technically dinosaurs, the sail-backed Dimetrodon is a well-known example of a pelycosaur. "Bien que n'étant pas techniquement des dinosaures, le Dimetrodon à dos en voile est un exemple bien connu de pélycosaurien.biologyanimalorganismsciencehistoryChat with AIVocabulary GamePractice Reading
