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say it: LAK-tik
lactic is an adjective meaning "of or relating to or obtained from milk (especially sour milk or whey)". It carries one recorded sense.
of or relating to or obtained from milk (especially sour milk or whey)
“lactic acid”
“lactic fermentation”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for lactic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.