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orpiment

[awr-puh-muh nt]
noun
  1. a mineral, arsenic trisulfide, As2S3, found usually in soft, yellow, foliated masses, used as a pigment.
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Origin of orpiment

1350–1400; Middle English < Old French < Latin auripigmentum pigment of gold; see auri-1, pigment
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for orpiment

orpiment

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: As 2 S 3
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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).

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Online Etymology Dictionary, © 2010 Douglas Harper