/ Dictionary / Index S sulfone: Meaning and Definition of Find definitions for: sul•fone Pronunciation: (sul'fōn), [key] — n. Chem. any of a class of organic compounds containing the bivalent group –SO–, united with two hydrocarbon groups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sulfonation sulfonic Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language