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Webster 1913 Edition
Realgar
Re-al′gar
(rē̍-ăl′gẽr)
, Noun.
[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.
Webster 1828 Edition
Realgar
RE'ALGAR
, n.A combination of sulphur and arsenic; red sulphuret of arsenic. Realgar differs from orpiment in having undergone a greater degree of heat.