Substrate - Definition

n 1: the substance that is acted upon by an enzyme or ferment
2: a surface on which an organism grows or is attached; "the
gardener talked about the proper substrate for acid-loving
plants" [syn: substrate, substratum]
3: any stratum or layer lying underneath another [syn:
substrate, substratum]
4: an indigenous language that contributes features to the
language of an invading people who impose their language on
the indigenous population; "the Celtic languages of Britain
are a substrate for English" [syn: substrate, substratum]