mercuric sulfide
or mercury sulfide
noun Chemistry.
a crystalline, water-insoluble, poisonous compound, HgS, occurring as a coarse, black powder (black mercuric sulfide) or as a fine, bright-scarlet powder (red mercuric sulfide): used chiefly as a pigment and as a source of the free metal.
Origin of mercuric sulfide
First recorded in 1850–55
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019