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realgar

noun

  1. arsenic disulfide mineral
L1380773 on Wikidata ↗

Wiktionary

Pronunciation: /ɹiˈæl.ɡɑː/ / /ɹiˈæl.ɡə/ / /ɹiˈæl.ɡɑɹ/

noun

Etymology: From Middle English realgar, from Medieval Latin realgar, resalgar, from Arabic رَهْج اَلْغَار (rahj al-ḡār, literally “cave dust”).

  1. A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.