/ Dictionary / Index G gypseous: Meaning and Definition of Find definitions for: gyp•se•ous Pronunciation: ( jip'sē-us), [key] — adj. of or pertaining to gypsum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gyp-room gypsiferous Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language