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 lemonyellow 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.
© Webster 1913.