The Collaborative International Dictionary
Superstrata
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.
Wiktionary
superstrata
n. (plural of superstratum English)
WordNet
superstrata
See superstratum