/sooh"peuhr stray'teuhm, -strat'euhm/ , n. , pl. superstrata /-stray'teuh, -strat'euh/ , superstratums .
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 .
[ 1800-10; SUPER- + STRATUM; cf. SUBSTRATUM ]