/ Dictionary / Index S sulfonyl: Meaning and Definition of Find definitions for: sul•fo•nyl Pronunciation: (sul'fu-nil), [key] — adj. Chem. sulfuryl. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sulfonium sulfonyl chloride Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language