"meltdown" in the noun sense
1. meltdown, nuclear meltdown
severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
2. meltdown
a disaster comparable to a nuclear meltdown
"there is little likelihood of a meltdown comparable to the American banking collapse in March 1933"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License