- the melting of a significant portion of a nuclear-reactor core due to inadequate cooling of the fuel elements, a condition that could lead to the escape of radiation.
- a quickly developing breakdown or collapse: a bond-market meltdown;the meltdown of a marriage.
- a sudden loss of control over one’s feelings or behavior: My toddler had a meltdown when I tried to leave the house.
- (in a nuclear reactor) the melting of the fuel rods as a result of a defect in the cooling system, with the possible escape of radiation into the environment
- a sudden disastrous failure with potential for widespread harm, as a stock-exchange crash
- the process or state of irreversible breakdown or decline
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