Definition of acid number
: a measure of the amount of free acids (as fatty acids) in a substance (as an oil or resin) usually expressed as the number of milligrams of potassium hydroxide required to neutralize one gram of the substance
— called also acid value
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“Acid number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acid%20number. Accessed 29 Jan. 2022.
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The first known use of acid number was in 1886
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