Definition of probiotic
: a microorganism (such as lactobacillus) that when consumed (as in a food or a dietary supplement) maintains or restores beneficial bacteria to the digestive tract
also
: a product or preparation that contains such microorganisms — compare prebiotic
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Merriam-Webster unabridged
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Time Traveler for probiotic
The first known use of probiotic was in 1974
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