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.