Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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nuclear winter a hypothesized result of a major nuclear war, wherein massive cloud covers of dust and smoke would block out sunlight, lowering the earth's temperature and destroying most living things.
winter solstice in the Northern Hemisphere, the day, usu. December 21, on which the period from sunrise to sunset is shortest.
winter squash any of several varieties of squash with thick hard rinds that can be stored for long periods.