/ Dictionary / Index S sulfanilic acid: Meaning and Definition of Find definitions for: sul'fa•nil'ic ac'id Pronunciation: (sul'fu-nil'ik, sul"-), [key] — Chem. Chem. a grayish-white, crystalline, slightly water-soluble solid, the para form of CHNOS, used chiefly as an intermediate in the manufacture of dyes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sulfanilamide sulfanilyl Related Content Daily Word Quiz: voracious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language