/ Dictionary / Index S selenite: Meaning and Definition of Find definitions for: sel•e•nite Pronunciation: (sel'u-nīt", si-lē'nīt), [key] — n. a variety of gypsum, found in transparent crystals and foliated masses. a salt of selenious acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. selenious acid selenium Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language