1580, in the meaning defined above
oil of the sick
oil of vitriol
oil of wintergreen
“Oil of vitriol.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oil%20of%20vitriol. Accessed 22 Dec. 2024.
Britannica.com: Encyclopedia article about oil of vitriol
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