Real Dictionary

lactic acid
uncountable noun: Lactic acid is a type of acid which is found in sour milk and is also produced by your muscles when you have been exercising a lot.

lactic acid in American English
a yellowish or clear, syrupy organic acid, CH3CHOHCOOH, produced by the fermentation of lactose when milk sours or from sucrose and some other carbohydrates by the action of certain microorganisms, and used in tanning leather, as a preservative, in the fo
noun: a colorless or yellowish, syrupy, water-soluble liquid, C3H6 O3, produced during muscle contraction as a product of anaerobic glucose metabolism, abundant in sour milk, prepared usually by fermentation of cornstarch, molasses, potatoes, etc., or synthesiz

lactic acid in British English
noun: a colourless syrupy carboxylic acid found in sour milk and many fruits and used as a preservative (E270) for foodstuffs, such as soft margarine, for making pharmaceuticals and adhesives, and produced in muscle tissue during strenuous exercise. Formula: CH

lactic acid in the Pharmaceutical Industry
noun: Lactic acid is an acid which is produced in muscles when glucose is metabolized. It is also found in sour milk.