Definition of realgar

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re·al·gar    (r-lgär, -gr) KEY 

NOUN:

A soft orange-red arsenic ore, As₂S₂, used in pyrotechnics and tanning and as a pigment.

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ETYMOLOGY:
Middle English, from Medieval Latin, from Catalan, from Arabic rahj al-r, powder (of) the mine or cave : rahj, powder + al-, the + r, cave; see rr in Semitic roots