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A worldwide darkening and cooling of the atmosphere with consequent devastation of life forms, believed to be a probable outcome of large-scale nuclear war.
(Environmental Science) a period of extremely low temperatures and little light that, it has been suggested, would occur as a result of a nuclear war
the worldwide devastation, darkness, and cold that conceivably could result from a nuclear war.
The prolonged period of cold, dark weather likely on a global scale if a large-scale nuclear war produced immense dust clouds shutting out light from the Sun.
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|Noun||1.||nuclear winter - a long period of darkness and extreme cold that scientists predict would follow a full-scale nuclear war; a layer of dust and smoke in the atmosphere would cover the earth and block the rays of the sun; most living organisms would perish|