Realgar

Webster's Condensed Dictionary- A Condensed Dictionary of the English Language · 1909 · p. 490

re-al'gar, n. (Min.) A natural or artificial combination of sulphur and arsenic in equal equivalents, of a brilliant red color red orpiment. [F. rialgar, NL. risigallum, Sp. rejalgar, Ar. rahj alghar; rahj, powder; al, (of) the; gkar, mine.]