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sub·nu·cle·ar | \ ˌsəb-ˈnü-klē-ər 
, -ˈnyü-, nonstandard -kyə-lər \
, -ˈnyü-, nonstandard -kyə-lər \Definition of subnuclear
: of, relating to, or being a particle smaller than the atomic nucleus
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The first known use of subnuclear was in 1937
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