- a mineral, mercuric sulfide, HgS, occurring in red crystals or masses: the principal ore of mercury.
- red mercuric sulfide, used as a pigment.
- bright red; vermillion.
- a bright red or brownish-red mineral form of mercuric sulphide (mercury(II) sulphide), found close to areas of volcanic activity and hot springs. It is the main commercial source of mercury. Formula: HgS. Crystal structure: hexagonal
- the red form of mercuric sulphide (mercury(II) sulphide), esp when used as a pigment
- a bright red to reddish-orange; vermilion
- a large red-and-black European moth, Callimorpha jacobaeae: family Arctiidae (tiger moths, etc)
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