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From The Collaborative International Dictionary of English v.0.48:
Orpiment \Or"pi*ment\, n. [F., fr. L. auripigmentum; aurum gold + pigmentum pigment. Cf. Aureate, Pigment, Orpin, Orpine.] (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. [1913 Webster] Our orpiment and sublimed mercurie. --Chaucer. [1913 Webster] Red orpiment, realgar; the red sulphide of arsenic. Yellow orpiment, king's yellow. [1913 Webster]