Etymology
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cinnabar (n.)

mid-15c., "red or crystalline form of mercuric sulphide," also applied to other ores of mercury, originally with reference to its use as a pigment; from Old French cinabre (13c.), from Late Latin cinnabaris, from Greek kinnabari, a foreign word, probably of Oriental origin (compare Persian zanjifrah in the same sense). Also used 14c.-17c. of red resinous juice of a certain Eastern tree, which was believed to be a mixture of dragon's and elephant's blood. Related: Cinnabaric.

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Definitions of cinnabar
1
cinnabar (n.)
a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury;
cinnabar (n.)
large red-and-black European moth; larvae feed on leaves of ragwort; introduced into United States to control ragwort;
Synonyms: cinnabar moth / Callimorpha jacobeae
2
cinnabar (adj.)
of a vivid red to reddish-orange color;
Synonyms: vermilion / vermillion / Chinese-red
From wordnet.princeton.edu