superstring

noun
su·​per·​string | \ˈsü-pər-ˌstriŋ \

Definition of superstring 

: a hypothetical string obeying the rules of supersymmetry whose vibrations manifest themselves as particles existing in ten dimensions of which only four are evident

First Known Use of superstring

1975, in the meaning defined above

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The first known use of superstring was in 1975

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