pre·bi·ot·ic
ˌprē-bī-ˈä-tik
1
: of, relating to, or being chemical or environmental precursors of the origin of life
… it is possible that either the prebiotic molecules necessary for the evolution of life or the raw materials from which these molecules formed were brought to Earth by comet-like objects.—Marcia Neugebauer
also
: existing or occurring before the origin of life
… RNA is a chemically fragile molecule, unlikely to survive the harsh prebiotic conditions. —Michael Egholm et al.
2
: of, relating to, or being a prebiotic
… next-generation probiotic microbes administered along with the appropriate prebiotic nutrients to nourish them.—Michael Pollan
: a substance and especially a carbohydrate (such as inulin) that is nearly or wholly indigestible and that when consumed (as in food) promotes the growth of beneficial bacteria in the digestive tract
Prebiotics are naturally found in certain fruits, vegetables, and herbs, including artichoke, asparagus, bananas, chicory, garlic, and onions.—Andrew Weil
compare probiotic
Cite this Entry
“Prebiotic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prebiotic. Accessed 31 Jul. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
