prebiotic

pre·bi·ot·ic

adj \-bī-ˈät-ik\

Definition of PREBIOTIC

: of, relating to, or being chemical or environmental precursors of the origin of life <prebiotic molecules>; also : existing or occurring before the origin of life <prebiotic conditions>

—pre·bi·ot·ic·al·ly \-i-k(ə-)lē\ adverb