Definition of "kefir" []

• A creamy drink made of fermented cow's milk. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But kefir is fermented with more and different types of bacteria, in addition to yeast, which means the final product has more of the beneficial microorganisms, or "probiotics," that first made yogurt a popular health food."
• "But kefir is simply not lactose-free, any more than yogurt is."
• "One of the benefits of both ayran and kefir is that the process of fermentation sees milk's natural sugar, lactose, broken down, used as food by the bacteria."