extratropical cyclone

[ek-struh-trop-i-kuhl, ek-]
any large-scale, cyclonic storm that is not a tropical cyclone, especially the common frontal cyclone of the middle and high latitudes.

1920–25; extra- + tropical

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Science Dictionary
extratropical cyclone   (ěk'strə-trŏp'ĭ-kəl)  Pronunciation Key 
See under cyclone.
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