/ Dictionary / Index D diopside: Meaning and Definition of Find definitions for: di•op•side Pronunciation: (dī-op'sīd, -sid), [key] — n. Mineral. a monoclinic pyroxene mineral, calcium magnesium silicate, CaMg(SiO), occurring in various colors, usually in crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diophantine equation diopsimeter Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language