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From The Collaborative International Dictionary of English v.0.48:
Kefir \Kef"ir\ (k[e^]f"[~e]r), n. 1. An effervescent liquor like kumiss, made from fermented milk, used as a food and as a medicine in the northern Caucasus. -- Ke*fir"ic (k[e^]*f[i^]r"[i^]k), a. [Webster 1913 Suppl.] 2. A sour fermented milk drink, used in various regions of Asia, made by addition of Streptococcus or Lactobacillus cultures to cow's or goat's milk; it is considered by some as a form of yoghurt. [PJC]