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