adstratum

[ad-strey-tuh m, -strat-uh m]
noun, plural ad·stra·ta [ad-strey-tuh, -strat-uh] /ˈædˌstreɪ tə, -ˌstræt ə/. Historical Linguistics.
  1. a substratum or superstratum.

Origin of adstratum

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018