ferrous sulfide

noun

: the monosulfide of iron FeS found in nature as pyrrhotite and as troilite, obtained as brown or black metallic masses by fusing iron and sulfur or as a black precipitate by adding an alkaline sulfide to the solution of a ferrous compound, and used chiefly in making hydrogen sulfide

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“Ferrous sulfide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ferrous%20sulfide. Accessed 1 Feb. 2023.

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