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funnel cloud

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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for funnel-cloud

funnel cloud

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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for funnel-cloud

a funnel-shaped cloud descending from a towering cumulus or cumulonimbus that, if it reaches the ground, becomes a tornado

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science's 21st Century Lexicon
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