kefir noun. [kǝ'fɪǝ, 'kɛfǝ] Also kephir. L19.
[Caucasian name.]
An effervescent liquor resembling kumis, prepared from fermented milk and employed as a medicine or food for invalids.

Comb.:
kefir grains a composite substance used in the Caucasus to ferment milk.

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