orpiment

noun
or·​pi·​ment | \ˈȯr-pə-mənt \

Definition of orpiment 

: a rare orange to lemon-yellow mineral consisting of a native trisulfide of arsenic

First Known Use of orpiment

14th century, in the meaning defined above

History and Etymology for orpiment

Middle English, from Anglo-French, from Latin auripigmentum, from aurum + pigmentum pigment

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The first known use of orpiment was in the 14th century

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