Definition of realgar in English:

realgar

Syllabification: re·al·gar
Pronunciation: /rēˈalgər, -ˌgär
 
/

noun

  • A soft, reddish mineral consisting of arsenic sulfide, formerly used as a pigment and in fireworks.
    More example sentences
    • Orpiment is a lesser mineral associated with realgar and lead sulfosalts in dolomite at Binnental, Valais, Switzerland.
    • It is an alteration product of realgar, native arsenic, and, less commonly, arsenopyrite.
    • The next morning we drove west to the famous town of Shimen, the locality for all the superb realgar and orpiment crystals.

Origin

late Middle English: via medieval Latin from Arabic rahj al-ġār 'arsenic', literally 'dust of the cave'.

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