/ Dictionary / Index P peridotite: Meaning and Definition of Find definitions for: per•i•do•tite Pronunciation: (per'i-dō"tīt, pu-rid'u-tīt"), [key] — n. a coarsely granular igneous rock composed chiefly of olivine with an admixture of various other minerals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: peridotite (Thesaurus) peridot peridot of Ceylon Related Content Daily Word Quiz: charlatan Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language