lactic

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

adjective of or relating to or obtained from milk (especially sour milk or whey)

From Latin lactis (“of milk”), genitive form of lac (“milk”), with the suffix -ic.

Sir Launcelot got up steam, he and I loaded up the kettle with unslaked lime and carbolic acid, with a touch of lactic acid added thereto, then filled the thing up with water and inserted the steam-spout under the canopy. — A Connecticut Yankee in King Arthur's Court, Mark Twain
You know about the invisible factors of fermentation, and how the fate of a jar of milk--whether it turn into a sour clot or a mass of koumiss--depends on whether the lactic acid ferment or the alcoholic is introduced first, and gets ahead of the other in starting the process. — The Will to Believe, and Other Essays in Popular Philosophy, William James

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