lacto

a combining form meaning “milk,” used in the formation of compound words (lactometer); specialized in chemical terminology to mean “lactate,” or “lactic acid.”

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Also, lacti-; especially before a vowel, lact-.

Origin:
< Latin lact- (stem of lac milk) + -o-

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Lacto is always a great word to know.

So is ninnyhammer. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a fool or simpleton; ninny.

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American Heritage

Medical Dictionary

lacto- or lact- or lacti-
pref.

Milk: lactoglobulin.
Lactose: lactase.
Lactic acid: lactate.

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