Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun nuclear_winter

1 sense of nuclear winter

Sense 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)
       => catastrophe, cataclysm -- (a sudden violent change in the earth's surface)