prebiotic

Also prebiological . existing or occuring before life, or serving as a precursor to it: These molecules played a critical role in the prebiotic evolution of life.Even if habitable conditions existed only briefly, relics of prebiotic chemistry or rudimentary life still might remain.

being, having, or relating to a substance containing dietary fiber that stimulates the growth or activity of beneficial bacteria in the gastrointestinal tract: Oats contain the prebiotic fiber beta-glucan.Prebiotic food sources include bananas, leeks, onions, chicory, asparagus, and artichoke.

a substance containing dietary fiber that stimulates the growth or activity of beneficial bacteria in the gastrointestinal tract: Our group has begun to develop strategies for incorporating prebiotics into convenience foods.: Compare probiotic (def. 1).

occurring or existing before the emergence of life