nuclear winter

noun

: the chilling of climate that is hypothesized to be a consequence of nuclear war and to result from the prolonged blockage of sunlight by high-altitude dust clouds produced by nuclear explosions

Word History

First Known Use

1983, in the meaning defined above

Time Traveler
The first known use of nuclear winter was in 1983

Browse Nearby Words

Cite this Entry

“Nuclear winter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nuclear%20winter. Accessed 20 Apr. 2025.

More from Merriam-Webster on nuclear winter

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!