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Related to kefir: Kefir grains
A creamy drink made of fermented cow's milk.
[Russian, probably ultimately from Old Turkic köpür, (milk) froth, foam, from köpürmäk, to froth, foam.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Cookery) an effervescent drink made from fermented milk, traditional in the Caucasus and now popular as a health product
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a tart-tasting drink made from cow's or sometimes goat's milk.
[1880–85; < Russian kefír]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.