Kefir Definition

Kefir or kephir (/kəˈfir/ kə-FEER) [as in keh in kettle, and fear]. Alternate spelling and names; kefyr, kewra, talai, mudu kekiya among other possible names in different countries. The word kefir is said to be derived from the Turkish word keif, which loosely translates to good feeling or feel good. This is quite likely because drinking kefir is renowned to increase a sense of well-being.

The word kefir, known in Russian since at least 1884, is probably of North Caucasian origin, although some sources see a connection to Turkic köpür (foam) or kef (foam that builds up on the surface of a boiling liquid). Kefir has become the most commonly used term, but other names are found in different geographic regions.

Kefir is a sour-tasting drink make from cow's milk fermented with certain bacteria. (Oxford Dictionaries)

Source :

https://en.wikipedia.org/wiki/Kefir

http://users.sa.chariot.net.au/~dna/kefirpage.html#what-is-kefir

https://en.oxforddictionaries.com/definition/us/kefir