mercuric sulfide

noun

: an insoluble compound HgS occurring in nature as the red mineral cinnabar and the black mineral metacinnabar and also made synthetically in red and black forms — called also mercury(II) sulfide; see vermilion 1a

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Chem.

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.

Also, mercury sulfide.

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mercuric sulfide,

= cinnabar. (Cf. ↑cinnabar)