[ proh-bahy-ot-ik ]
/ ˌproʊ baɪˈɒt ɪk /


a usually dairy food or a dietary supplement containing live bacteria that replace or add to the beneficial bacteria normally present in the gastrointestinal tract.
a bacterium in such a food or dietary supplement.


noting or pertaining to a probiotic: a probiotic yogurt drink.

Origin of probiotic

1950-55; pro-1 + biotic, on the model of antibiotic Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for probiotic

British Dictionary definitions for probiotic

/ (ˌprəʊbaɪˈɒtɪk) /


a harmless bacterium that helps to protect the body from harmful bacteria
a substance that encourages the growth of natural healthy bacteria in the gut


of or relating to probioticsprobiotic yogurt

Word Origin for probiotic

C20: from pro- 1 + (anti) biotic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for probiotic

[ prō′bī-ŏtĭk ]


A dietary supplement containing live bacteria or yeast that supplements normal gastrointestinal flora, given especially after depletion of flora caused by infection or ingestion of an antibiotic drug.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.