virga

[vur-guh]
noun (used with a singular or plural verb) Meteorology.
streaks of water drops or ice particles falling out of a cloud and evaporating before reaching the ground (distinguished from praecipitatio ).

Origin:
1935–40; < Latin: rod, streak

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World English Dictionary
virga (ˈvɜːɡə)
 
n
(sometimes functioning as plural) meteorol wisps of rain or snow, seen trailing from clouds, that evaporate before reaching the earth
 
[C20: from Latin: streak]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
virga   (vûr'gə)  Pronunciation Key 
Light wisps of precipitation streaming from a cloud but evaporating before reaching the ground, especially when the air below is low in humidity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They themselves sometimes produce virga, which is rain or snow that does not reach the ground.
For example, a narrow band of virga may appear similar to a high funnel cloud.
Rain or virga will tend to cool the air as it falls through it.
On this day, there were a few bands of weak reflectivity with virga and some light rain.
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