subnuclear

adjective
sub·​nu·​cle·​ar | \ˌsəb-ˈnü-klē-ər, -ˈnyü-, nonstandard -kyə-lər\

Definition of subnuclear 

: of, relating to, or being a particle smaller than the atomic nucleus

First Known Use of subnuclear

1937, in the meaning defined above

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The first known use of subnuclear was in 1937

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