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post·nu·cle·ar | \ ˌpōs(t)-ˈn(y)ü-klē-ər 
\
\variants:
or post-nuclear
Definition of postnuclear
: of, relating to, occurring in, or suggestive of a period following a nuclear war
… a macho street hero who arrives to clean up a tough town in a postnuclear tomorrow.— Fred Robbins … a post-nuclear thriller about an astronaut … struggling to stay alive amid earth's devastation. — TV Guide … a postnuclear landscape of poverty and blight …— Richard Corliss
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Time Traveler for postnuclear
The first known use of postnuclear was in 1950
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