/ Dictionary / Index D diorite: Meaning and Definition of Find definitions for: di•o•rite Pronunciation: (dī'u-rīt"), [key] — n. a granular igneous rock consisting essentially of plagioclase feldspar and hornblende. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diorite (Thesaurus) diorama dioscin Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language