orpiment

[ awr-puh-muh nt ]
/ ˈɔr pə mənt /

noun

a mineral, arsenic trisulfide, As2S3, found usually in soft, yellow, foliated masses, used as a pigment.

Origin of orpiment

1350–1400; Middle English < Old French < Latin auripigmentum pigment of gold; see auri-1, pigment
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British Dictionary definitions for orpiment

orpiment

/ (ˈɔːpɪmənt) /

noun

a yellow mineral consisting of arsenic trisulphide in monoclinic crystalline form occurring in association with realgar: it is an ore of arsenic. Formula: As 2 S 3

Word Origin for orpiment

C14: via Old French from Latin auripigmentum gold pigment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012