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(organic chemistry) 2-hydroxy-propanoic acid (CH₃.CHOH.CO₂H), a syrupy liquid, soluble in water; found in milk, wine and many fruits; used as a food additive and in many industrial applications.

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lactic acid

After an intense workout, lactic acid may build up in the muscles and result in that familiar burning sensation.

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After an intense workout, lactic acid may build up in the muscles and result in that familiar burning sensation.

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