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[mass noun] A colourless syrupy organic acid formed in sour milk, and produced in the muscle tissues during strenuous exercise.
- ‘Without these enzymes, lactic acid and other organic acids build up in the body.’
- ‘The effect of this is too gradually calm down the muscles but also to help the removal of lactic acid from the muscle tissues.’
- ‘The bacteria consume lactose, a complex sugar found in milk, and produce lactic acid.’
- ‘Scheele also discovered many of what we now call organic acids, for example lactic acid in sour milk and citric, malic, and tartaric acids in fruits.’
- ‘Doctors may prescribe an ointment that contains urea or lactic acid to relieve symptoms.’
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