|  meltdown 
 
 1. severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
 • Syn:
 nuclear meltdown
 • Hypernyms:
 overheating
 2. a disaster comparable to a nuclear meltdown
 - there is little likelihood of a meltdown comparable to the American banking collapse in March 1933
 • Hypernyms:
 calamity, catastrophe, disaster, tragedy, cataclysm
 
 
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