substrate

Noun
  1. The substance that is acted upon by an enzyme or ferment (synset 114763071)
  2. A surface on which an organism grows or is attached (synset 108677777)
    "the gardener talked about the proper substrate for acid-loving plants"
  3. Any stratum or layer lying underneath another (synset 108675518)
  4. An indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population (synset 106916475)
    "the Celtic languages of Britain are a substrate for English"

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