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
Our orpiment and sublimed mercurie. Chaucer. [ 1913 Webster ]
Red orpiment,
Yellow orpiment,