pelycosaurianadj.n.
/ˌpɛlɪkəˈsɔːrɪən/, U.S. /ˈˌpɛləkəˈsɔriən/ Palaeontology.
A. adj.
Of, relating to, designating, or characteristic of a pelycosaur or pelycosaurs.
ΘΚΠ
the world > animals > reptiles > extinct reptiles and dinosaurs > [adjective] > of order Sauria > of or relating to pelycosaur
pelycosaurian1879
pelycosaur1884
1879 Amer. Naturalist 13 333 He referred it to a new genus, under the name of Euchyrosaurus, which is probably Pelycosaurian.
1915 Philos. Trans. (Royal Soc.) B. 206 9 Every element of the Pelycosaurian skull is found in similar position to the early Therapsids.
1966 Ecology 47 291 The evolutionary course from primitive pelycosaurian reptiles through therapsids to mammals.
1993 Ann. Carnegie Mus. 62 307 The general features of most pelycosaurian families were established well before the time of the more commonly preserved Permian pelycosaurs.
B. n.
A pelycosaur. Now rare.
ΘΚΠ
the world > animals > reptiles > extinct reptiles and dinosaurs > [noun] > Sauria > member of order Pelycosauria
pelycosaurian1880
pelycosaur1884
1880 Athenæum 6 Nov. 612/1 Mr. Cope's group of Pelycosaurians in North America.
1903 Amer. Naturalist 37 100 In the American Pelycosaurians the bones of the temporal arches all retained their identity and remained distinct one from the other.
1930 H. H. Swinnerton Outl. Palæontol. (ed. 2) xii. 334 Dimetrodon was a typical Pelycosaurian.
This is a new entry (OED Third Edition, September 2005; most recently modified version published online March 2022).
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adj.n.1879