/ Dictionary / Index D diplodocus: Meaning and Definition of Find definitions for: di•plod•o•cus Pronunciation: (di-plod'u-kus), [key] — pl. -cus•es. a huge herbivorous dinosaur of the genus Diplodocus, from the Late Jurassic Epoch of western North America, growing to a length of about 87 ft. (26.5 m). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diplodocus (Thesaurus) diplococcus diploë Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language