/ Dictionary / Index P peridot: Meaning and Definition of Find definitions for: per•i•dot Pronunciation: (per'i-dō", -dot"), [key] — n. Mineral. a green transparent variety of olivine, used as a gem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: peridot (Thesaurus) peridium peridotite Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language