Definition of "superstrate"

superstrate

noun
plural superstrates
1. A layer or stratum adjacent and parallel to another.
2. (physics) The sudden increase in the electrical conductivity of some metals as their temperature falls to near absolute zero.
3. (photovoltaics) The covering on the sunny side of a photovoltaic (PV) module, providing protection for the PV materials from impact and environmental degradation while allowing maximum transmission of the appropriate wavelengths of the solar spectrum.
4. (linguistics) Alternative form of superstratum
  Quotations
  However influential Sanskrit and Pāli were, then, linguistically both were limited to a “superstrate” role here: nowhere did they replace the native tongues of Southeast Asia.
  2014, Colin Renfrew, Paul Bahn, The Cambridge World Prehistory‎, Cambridge University Press
verb
third-person singular simple present superstrates, present participle superstrating, simple past and past participle superstrated
1. To arrange in parallel layers or strata.