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.
Informal. 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
(informal) a sudden disastrous failure with potential for widespread harm, as a stock-exchange crash
(informal) the process or state of irreversible breakdown or decline: the community is slowly going into meltdown
by 1937 in the ice-cream industry; by 1956 in reference to a nuclear reactor, from verbal phrase, from melt (v.) + down (adv.). Metaphoric extension since 1979.
Severe overheating of a nuclear reactor core, resulting in melting of the core and escape of radiation.
The most serious accident that can occur at a nuclear reactor. In a meltdown, the radioactive material in the reactor becomes very hot, melting some or all of the fuel in the reactor. A meltdown may or may not be followed by the release of radioactive material to the environment. A partial meltdown, with very little external radiation, occurred at Three Mile Island in 1979; a complete meltdown happened at Chernobyl in 1986.
Something very long and tedious told or explained exhaustively: I’ve been listening to all this here Megillah/Let’s not have the megillah/a whole megilla (song and dance)
[1909+; fr Yiddish fr Hebrew, ”scroll, volume,” esp the Book of Esther read aloud in its entirety at Purim celebrations]
/mɛlˈtɛmɪ/ noun 1. a northerly wind in the northeast Mediterranean; etesian wind
[mel-ter] /ˈmɛl tər/ noun 1. a person or thing that . 2. a person in charge of a steelmaking furnace.
[melt] /mɛlt/ verb (used without object), melted, melted or molten, melting. 1. to become liquefied by warmth or heat, as ice, snow, butter, or metal. 2. to become liquid; dissolve: Let the cough drop melt in your mouth. 3. to pass, dwindle, or fade gradually (often followed by away): His fortune slowly melted away. 4. […]
noun, Physical Chemistry. 1. the temperature at which a solid substance melts or fuses. noun 1. the temperature at which a solid turns into a liquid. It is equal to the freezing point melting point (měl’tĭng) The temperature at which a solid, given sufficient heat, becomes a liquid. For a given substance, the melting point […]