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- Dictionarytornado/tɔːˈneɪdəʊ/
noun
- 1. a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system.
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noun
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Violently rotating column of air that is in contact with both the earth's surface and a cumulonimbus cloud in the air
A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. Wikipedia