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rotor cloud

noun
1.
a cloud within and around which the air is rotating about a horizontal axis, occurring in the lee of a large mountain barrier.
Also called roll cloud.
Origin
1955-1960
1955-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Difficulty index for rotor cloud

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Word Value for rotor

5
5
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