[syn: superstrate, superstratum]
The Collaborative International Dictionary of English v.0.48:
Superstratum \Su`per*stra"tum\, n.; pl. Superstrata. [NL.: cf.
L. supersternere, superstratum, to spread upon. See Super-,
and Stratum.]
A stratum, or layer, above another.
[1913 Webster]
WordNet (r) 3.0 (2006):
superstratum
n 1: any stratum or layer superimposed on another [syn:
superstrate, superstratum]
2: the language of a later invading people that is imposed on an
indigenous population and contributes features to their
language [syn: superstrate, superstratum]