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noun Orpiment n. (Chem.) Arsenic sesquisulphide, produced artificially as an amorphous lemon-yellow powder, and occurring naturally as a yellow crystalline mineral; formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing. "Our orpiment and sublimed mercurie." Red orpiment, realgar; the red sulphide of arsenic. Yellow orpiment, king's yellow.
Collaborative International Dictionary of English 0.48
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