/ Dictionary / Index D diapsid: Meaning and Definition of Find definitions for: di•ap•sid Pronunciation: (dī-ap'sid), [key] — adj. (of reptiles) having two openings in the skull behind each eye, characteristic of the subclasses Lepidosauria and Archosauria, including all living reptiles except turtles. —n. a diapsid reptile. Cf. anapsid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diapsid (Thesaurus) diapositive Diarbekr Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language