The Collaborative International Dictionary
auripigment
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.
Our orpiment and sublimed mercurie.
--Chaucer.
Red orpiment, realgar; the red sulphide of arsenic.
Yellow orpiment, king's yellow.
Wiktionary
auripigment
n. (form of Variant orpiment English)