superstratum
(so̵̅o̅′pər strāt′em, -strat′-)
See superstratum in American Heritage Dictionary 4
noun pl. su·per·stra·ta (-strāˌtə, -strătˌə) - One layer or stratum superimposed on another.
- Linguistics The language of a later, invading people imposed on and leaving features in an indigenous language.