1760, in the meaning defined above
Latin subacidus, from sub- + acidus acid
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subacute sclerosing panencephalitis
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“Subacid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subacid. Accessed 21 Oct. 2020.
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Britannica English: Translation of subacid for Arabic Speakers
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