/ Dictionary / Index P phosphite: Meaning and Definition of Find definitions for: phos•phite Pronunciation: (fos'fīt), [key] — n. Chem. (loosely) a salt of phosphorous acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phosphine phospho- Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language