/ Dictionary / Index C calcite: Meaning and Definition of Find definitions for: cal•cite Pronunciation: (kal'sīt), [key] — n. one of the commonest minerals, calcium carbonate, CaCO, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc-spar. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: calcite (Thesaurus) calciphobe calcitonin Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language