Kalmar “superstratum” tana nufin kalmar harshe da ake amfani da ita don bayyana ɓangarorin ƙamus, nahawu, ko tasirin harshe wanda aka aro ko aka ɗauka a kan wani harshe da ake da shi, yawanci sakamakon cudanya tsakanin al’ummomin harsuna daban-daban. Harshen superstratum sau da yawa yana cikin ƙungiyar da ke da rinjaye, yayin da yaren da ake da shi yana magana da ƙungiyar da ke ƙarƙashinsa ko waɗanda aka ware. Ana amfani da wannan kalma da yawa a fannin ilimin zamantakewa da ilimin harshe na tarihi don bayyana tasirin hulɗar harshe da aro akan juyin halittar harshe.A faffadar ma'ana, "superstratum" kuma za a iya amfani da shi a misaltacciya don siffanta kowane yanki mai rinjaye ko babba. ko tasiri wanda aka ɗora akan tsarin da ya rigaya ya kasance ko tsari. An samo kalmar daga kalmomin Latin "super," ma'ana "sama" ko "over," da "stratum," ma'ana "Layer" ko "mataki."