Breadcrumb Home > Dictionary > Index G gypsum: Meaning and Definition of Find definitions for: gyp•sum Pronunciation: ( jip'sum), [key] — n. a very common mineral, hydrated calcium sulfate, CaSO&multiplydot;2HO, occurring in crystals and in masses, soft enough to be scratched by the fingernail: used to make plaster of Paris, as an ornamental material, as a fertilizer, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gypsum (Thesaurus) gypster gypsum board TrendingHere are the facts and trivia that people are buzzing about. The Book of Philippians: Summary Current Events This Week: May 2023 Preamble of the United Nations Charter Queen Victoria Books of the Bible: New Testament Books in Order The 88 Recognized Constellations ✖ Related Content Daily Word Quiz: panache Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language