Middle English, from Medieval Latin, from Catalan, from Arabic rahj al-ghār powder of the mine
15th century, in the meaning defined above
“Realgar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/realgar. Accessed 27 Sep. 2023.
Britannica.com: Encyclopedia article about realgar
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