/ Dictionary / Index D deinonychus: Meaning and Definition of Find definitions for: dei•non•y•chus Pronunciation: (dī-non'i-kus), [key] — n. a small bipedal dinosaur, genus Deinonychus, of the Cretaceous Period, characterized by having a large, curved claw on each hind foot. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: deinonychus (Thesaurus) deindustrialize deinstitutionalize Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language