substratum meaning and definition

SUBSTRATUM noun

Definition of substratum (noun)

1. a surface on which an organism grows or is attached
   • "the gardener talked about the proper substrate for acid-loving plants"
   • synonyms: substrate
2. any stratum or layer lying underneath another
   • synonyms: substrate
3. 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"
   • synonyms: substrate