synapsid

syn ap sid |səˈnapsid səˈnæpsɪd | ▶noun a fossil reptile of a Permian and Triassic group, the members of which show increasingly mammalian characteristics and include the ancestors of mammals. Also called mammallike reptile. [Subclass Synapsida; includes the pelycosaurs and the therapsids. ] ORIGIN early 20th cent.: from modern Latin Synapsida, from Greek sun- ‘together ’ + apsis, apsid- ‘arch. ’

synapsid

synapsid |sʌɪˈnapsɪd, sɪ -| ▶noun a fossil reptile of a Permian and Triassic group, the members of which show increasingly mammalian characteristics and include the ancestors of mammals. Also called mammal-like reptile. ●Subclass Synapsida; includes the pelycosaurs and the therapsids. ORIGIN early 20th cent.: from modern Latin Synapsida, from Greek sun- ‘together ’ + apsis, apsid- ‘arch ’.