Severe overheating of the core of a nuclear reactor resulting in the core melting and potentially in radiation escaping. / A situation being likened to a nuclear meltdown; a crisis.

plural of meltdown

(genetics) The process by which a small population accumulates harmful mutations, which leads to loss of fitness and decline of the population size, which may lead to further accumulation of deleterious mutations due to fixation by genetic drift.

plural of mutational meltdown

A move in contra dancing in which a gypsy precedes a swing.

A severe nuclear reactor accident that results in core damage from overheating

plural of gypsy meltdown

plural of nuclear meltdown