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extratropical cyclone

[ek-struh-trop-i-kuh l, ek-] /ˈɛk strəˈtrɒp ɪ kəl, ˌɛk-/
noun
1.
any large-scale, cyclonic storm that is not a tropical cyclone, especially the common frontal cyclone of the middle and high latitudes.
Origin
1920-1925
1920-25; extra- + tropical
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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extratropical cyclone in Science
extratropical cyclone
  (ěk'strə-trŏp'ĭ-kəl)   
See under cyclone.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for extratropical cyclone

a type of storm system formed in middle or high latitudes, in regions of large horizontal temperature variations called frontal zones. Extratropical cyclones present a contrast to the more violent cyclones or hurricanes of the tropics, which form in regions of relatively uniform temperatures.

Learn more about extratropical cyclone with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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