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meltdown
vaccinate
rare
failure
hypothetical
melt
containment
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western hemisphere
planet
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catastrophic
nuclear reactor
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poliomyelitis
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Noun
Definition: A hypothetical kind of catastrophic failure in which a nuclear reactor melts through the floor of its containment system and penetrates the Earth's surface, continuing downward as if (from a Western Hemispheric point of view) traveling through the planet toward China.