n. Unterschicht (Geol.); Unterlage, Grundlage, Substrat (Phil.); Nährboden, Keimboden (Biol.)

n. substratum

an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population: substrate, indigenous language
any stratum or layer lying underneath another: substrate, stratum
a surface on which an organism grows or is attached: substrate, surface