/ Dictionary / Index S sulfonate: Meaning and Definition of Find definitions for: sul•fo•nate Pronunciation: (sul'fu-nāt"), [key] — n., v., -nat•ed, -nat•ing. —n. an ester or salt derived from a sulfonic acid. —v.t. to make into a sulfonic acid, as by treating an aromatic hydrocarbon with concentrated sulfuric acid. to introduce the sulfonic group into (an organic compound). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sulfonate (Thesaurus) sulfonamide sulfonation 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