substratum

Other forms: substratums

Definitions of substratum

1. noun

   any stratum or layer lying underneath another
   synonyms: substrate

   type of:

   stratum

   one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
2. noun

   a surface on which an organism grows or is attached
   synonyms: substrate

   type of:

   surface

   the extended two-dimensional outer boundary of a three-dimensional object
3. noun

   an indigenous language that contributes features to the language of an invading people who impose their language on the indigenous population
   synonyms: substrate

   type of:

   indigenous language

   a language that originated in a specified place and was not brought to that place from elsewhere