Therapsid Definition

thə-răpsĭd
noun
Any of various amniote vertebrates that emerged in the Permian Period and diversified in the Triassic, including the mammals, their ancestors, and their relatives.
American Heritage

(biology) Any extinct reptile of the order Therapsida; thought to be direct ancestors of the mammals.

Wiktionary
Synonyms:

Other Word Forms of Therapsid

Noun

Singular:
therapsid
Plural:
therapsids

Origin of Therapsid

  • From New Latin Thērapsida order name Greek thēr wild animal theropod Greek hapsis hapsid- arch, vault (from the enlarged lower temporal opening characteristic of the group) apsis

    From American Heritage Dictionary of the English Language, 5th Edition

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therapsid