From Longman Dictionary of Contemporary Englishlactic acidlac‧tic ac‧id /ˌlæktɪk ˈæsɪd/ noun [uncountable] HCCDFNan acid produced by muscles after exercising and found in sour milk
Examples from the Corpus
lactic acid• Cultured buttes-milk is pasteurized skim milk or low-fat milk that has been soured by lactic acid producing bacteria or other similar culture.• I remember seeing a tooth being stripped of its enamel by soaking in lactic acid.• But these helper molecules are normally used to process many other toxins, including lactic acid.• Taken in mid-morning, it coated the teeth and then incubated until lunchtime; the lactose fermented into lactic acid.• One factor contributing to this malaise is the buildup of lactic acid in the muscles that can follow heavy drinking.• They effect formation of lactic acid and flavor components.• Once the lactic acid is dealt with, those aches and pains should not be as bad.• The treatment can decrease the time it takes the body to remove the lactic acid build-up in your muscles. 