synapsid

== English == === Etymology === From translingual Synapsida, from syn- + Ancient Greek ἁψίς (hapsís, “arch”). === Pronunciation === (UK) IPA(key): /sɪˈnapsɪd/ === Adjective === synapsid (not comparable) Pertaining to the class Synapsida of animals which have an opening low in the skull roof behind each eye, leaving a bony arch beneath each. === Noun === synapsid (plural synapsids) Any animal (all mammals) of the class Synapsida. ==== Synonyms ==== mammal-like reptile (dated) stem mammal ==== Translations ====