Realgar meaning

rē-ăl'gär', -gər
A soft orange-red arsenic ore, As2 S2 , used in pyrotechnics and tanning and as a pigment.
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A bright orange-red, monoclinic mineral, AsS, used in fireworks, paints, etc.; arsenic sulfide.
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(mineralogy) A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.
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Origin of realgar

  • Middle English from Medieval Latin from Catalan from Arabic rahj al-ġār powder (of) the mine or cave rahj powder al- the ġār cave ġrr in Semitic roots
    From American Heritage Dictionary of the English Language, 5th Edition
  • Old English, from Medieval Latin, from Arabic رهج الغار (rahj-al-ğār, “cave dust”).
    From Wiktionary