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realgar

[ree-al-ger, -gahr]
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noun
  1. arsenic disulfide, As2S2, found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics.
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Origin of realgar

1350–1400; Middle English < Medieval Latin realgerArabic rahj al-ghār powder of the mine or cave
Also called red orpiment.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for realgar

realgar

noun
  1. a rare orange-red soft mineral consisting of arsenic sulphide in monoclinic crystalline form. It occurs in Utah and Romania and as a deposit from hot springs. It is an important ore of arsenic and is also used as a pigment. Formula: AsS
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Word Origin

C14: via Medieval Latin from Arabic rahj al-ghar powder of the mine
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