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orpiment

[awr-puh-muh nt] /ˈɔr pə mənt/
noun
1.
a mineral, arsenic trisulfide, As 2 S 3 , found usually in soft, yellow, foliated masses, used as a pigment.
Origin
1350-1400
1350-1400; Middle English < Old French < Latin auripigmentum pigment of gold; see auri-1, pigment
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for orpiment

orpiment

/ˈɔːpɪmənt/
noun
1.
a yellow mineral consisting of arsenic trisulphide in monoclinic crystalline form occurring in association with realgar: it is an ore of arsenic. Formula: As2S3
Word Origin
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
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Word Origin and History for orpiment
n.

late 13c., from Old French orpiment "arsenic trisulphide, yellow color," from Latin auripigmentum, from aurum "gold" (see aureate) + pigmentum "coloring matter, pigment, paint" (see pigment).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for orpiment

the transparent yellow mineral arsenic sulfide (As2S3), formed as a hot-springs deposit, an alteration product (especially from realgar), or as a low-temperature product in hydrothermal veins. It is found in Copalnic, Romania; Andreas-Berg, Ger.; Valais, Switz.; and Colemerik, Tur. The crystals belong to the monoclinic system. For detailed physical properties, see sulfide mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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