Dictionary![]() ![]() ex'tra•trop'i•cal cy'clonePronunciation: (ek'stru-trop'i-kul, ek"-), [key] any large-scale, cyclonic storm that is not a tropical cyclone, esp. the common frontal cyclone of the middle and high latitudes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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