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acid number

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noun Chemistry.

a number expressing the acidity of a substance, equal to the number of milligrams of potassium hydroxide needed to neutralize the free fatty acids present in one gram of the substance.

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The rainy weather could not ________ my elated spirits on my graduation day.
Also called acid value.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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