realgar
noun
- arsenic disulfide mineral
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”).
- A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.