\mˈɛltda͡ʊn], \mˈɛltdaʊn], \m_ˈɛ_l_t_d_aʊ_n]\
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By Princeton University
1. The point where nuclear core overheats and melts causing a core failure. Known to be a catastrophic event it causes the loss of radioactive materials containment, which are released into the environment. 2. Non-nuclear events with actual or perceived catastrophic endings, as if it were a nuclear meltdown. A person may experience an emotional meltdown due to actual or perceived overwhelming stress.
By Henry Campbell Black