[soo-per-strey-tuhm, -strat-uhm, soo-per-strey-tuhm, -strat-uhm]
noun, plural superstrata [soo-per-strey-tuh, -strat-uh, soo-per-strey-tuh, -strat-uh] , superstratums.
an overlying stratum or layer.
Historical Linguistics. 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.
Compare substratum.

1800–10; super- + stratum; cf. substratum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superstratum (ˌsuːpəˈstrɑːtəm, -ˈstreɪ-)
n , pl -ta, -tums
1.  geology a layer or stratum overlying another layer or similar structure
2.  linguistics Compare substratum the language of a conquering or colonizing population as it supplants that of an indigenous population, as for example French and English in the Caribbean

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