rainband

[reyn-band]
noun
a dark band in the solar spectrum caused by water vapor in the atmosphere.

Origin:
1880–85; rain + band2

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World English Dictionary
rainband (ˈreɪnˌbænd)
 
n
a dark band in the solar spectrum caused by water in the atmosphere

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Subsidence is distributed over a wide area on the outside of the rainband but is concentrated in the small inside area.
The mean virtual potential temperature deviation of rainband updrafts increases from slightly negative to slightly positive.
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