Tornado-cloud
noun
1.
funnel cloud.
funnel cloud
noun
1.
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.
funnel cloud
noun
1.
a whirling column of cloud extending downwards from the base of a cumulonimbus cloud: part of a waterspout or tornado
noun
a funnel-shaped cloud descending from a towering cumulus or cumulonimbus that, if it reaches the ground, becomes a tornado
Usage Note
science
Read Also:
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