ˈȯ(r)pəmənt noun
( -s )
Etymology: Middle English, from Middle French, from Latin auripigmentum, from auri- + pigmentum pigment — more at pigment
1.
a. : an orange to yellow mineral As 2 S 3 consisting of arsenic trisulfide and frequently associated with realgar
b. : artificially produced arsenic trisulfide
2. or orpiment yellow : a light to brilliant yellow that is darker than empire yellow — called also king's yellow, mineral yellow, Montpellier yellow, patent yellow, quercitron, realgar yellow, royal yellow, Turner's yellow, Verona yellow, Veronese yellow, yellow daisy