kefir

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ke·fir

(ke-fēr')
An enzyme-rich drink made from fermented milk that helps maintain the workings of the gastrointestinal tract.

kefir

, kefyr (ke′fir, kē′fĕr) [Russian kefir]
A preparation of curdled milk made originally in the Caucasus by adding grains of kefir (a probiotic combination of bacteria, yeasts, proteins, lipids, and sugars) to milk.