funnel-cloud

funnel cloud

noun
a rapidly rotating funnel-shaped cloud extending downward from the base of a cumulonimbus cloud, which, if it touches the surface of the earth, is a tornado or waterspout.
Also called pendant cloud, tornado cloud, tuba.
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World English Dictionary
funnel cloud
 
n
a whirling column of cloud extending downwards from the base of a cumulonimbus cloud: part of a waterspout or tornado

Collins English Dictionary - Complete & Unabridged 10th Edition
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