SYNAPSID

synapsid, synapsid reptile

(noun) extinct reptile having a single pair of lateral temporal openings in the skull

Source: WordNet® 3.1

Etymology

Adjective

synapsid (comparative more synapsid, superlative most synapsid)

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 (including all mammals) of the class Synapsida.

Synonyms

• mammal-like reptile (dated)

• stem mammal

Source: Wiktionary

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