Pronunciation: (sOO'pur-strā"tum,--strat"um), [key]
—pl. -stra•taPronunciation: (-strā"tu,--strat"u), [key] -stra•tums.
1. an overlying stratum or layer.
2. Historical Ling.a set of features of a language traceable to the influence of a language formerly spoken within the same society by a dominant group: English has a Norman-French superstratum. Cf. substratum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.