realgar

noun
re·​al·​gar | \rē-ˈal-ˌgär, -gər\

Definition of realgar 

: an orange-red mineral consisting of arsenic sulfide and having a resinous luster

First Known Use of realgar

15th century, in the meaning defined above

History and Etymology for realgar

Middle English, from Medieval Latin, from Catal, from Arabic rahj al-ghār powder of the mine

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The first known use of realgar was in the 15th century

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