substrate(n = noun.location) substratum - a surface on which an organism grows or is attached; "the gardener talked about the proper substrate for acid-loving plants"
substrate(n = noun.communication) substratum - 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"
substrate, n.
1 = SUBSTRATUM.
2 a surface to be painted, printed, etc., on.
3 Biol. a the substance upon which an enzyme acts. b the surface or material on which any particular organism grows.