Re‐al″gar (rē̍‐ăl″gẽr), n. [F. réalgar, Sp. rejalgar, Ar. rahj al ghār powder of the mine.] (Min.) Arsenic sulphide, a mineral of a brilliant red color; red orpiment. It is also an artificial product.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.