/ Dictionary / Index F ferrous sulfide: Meaning and Definition of Find definitions for: fer'rous sul'fide Pronunciation: [key] — Chem. Chem. a dark or black metallic crystalline compound, FeS, insoluble in water, soluble in acids, used in ceramics and to generate hydrogen sulfide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ferrous sulfate ferrovanadium Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language