/ Dictionary / Index S sulfurous: Meaning and Definition of Find definitions for: sul•fur•ous Pronunciation: (sul'fur-us, sul-fyoor'us), [key] — adj. of, pertaining to, or containing sulfur, esp. in the tetravalent state. of the yellow color of sulfur. sulphurous (defs. 2, 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sulfurous (Thesaurus) sulfurize sulfurous acid Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language