diapsid

adjective
di·ap·sid | \dī-ˈap-səd \

Definition of diapsid 

: of, relating to, or including reptiles (such as the crocodiles) with two pairs of temporal openings in the skull

First Known Use of diapsid

circa 1909, in the meaning defined above

History and Etymology for diapsid

ultimately from Greek di- + hapsid-, hapsis loop, arch — more at apsis

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The first known use of diapsid was circa 1909

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Britannica.com: Encyclopedia article about diapsid

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