Also found in: Thesaurus, Encyclopedia, Wikipedia.
Any of various extinct, chiefly carnivorous synapsids of the Carboniferous and Permian Periods, including the dimetrodon and other species with saillike structures along the back.
[New Latin Pelycosauria, name of the former suborder in which the various pelycosaurs were classified : Greek pelux, peluk-, bowl, cup (from the typical shape of the ischium ) + Greek sauros, lizard.]
(Palaeontology) any extinct mammal-like reptile of the order Pelycosauria, of Upper Carboniferous to Lower Permian times, from which the therapsids are thought to have evolved
[C19: from New Latin Pelycosauria, from Greek pelyx bowl, pelvis, + -saur]
Switch to new thesaurus
|Noun||1.||pelycosaur - large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America|
synapsid, synapsid reptile - extinct reptile having a single pair of lateral temporal openings in the skull