14th century, in the meaning defined above
Middle English, borrowed from Anglo-French acetus, borrowed from Medieval Latin acētōsus, from Latin acētum "vinegar" + -ōsus -ous — more at acetic acid
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“Acetous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acetous. Accessed 3 Dec. 2021.
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