therapsid
Concise Oxford English Dictionary © 2008 Oxford University Press:
therapsid /θɛˈrapsɪd/
▶noun Palaeontology a fossil reptile of a large group including the cynodonts, related to the ancestors of mammals.
– origin early 20th cent.: from mod. L. Therapsida (name of an order), from Gk thēr ‘beast’ + hapsis, hapsid- ‘arch’ (referring to the structure of the skull).
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