superstratum

noun
su·​per·​stra·​tum | \ ˈsü-pər-ˌstrā-təm How to pronounce superstratum (audio) , -ˌstra-; ˌsü-pər-ˈstrā-, -ˈstra-\
plural superstrata\ ˈsü-​pər-​ˌstrā-​tə How to pronounce superstrata (audio) , -​ˌstra-​ ; ˌsü-​pər-​ˈstrā-​ , -​ˈstra-​ \

Definition of superstratum

: an overlying stratum or layer The superstratum of timidity which often overlies those who are daring and defiant at heart had been passed through …— Thomas Hardy

First Known Use of superstratum

1703, in the meaning defined above

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The first known use of superstratum was in 1703

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