/ ˈsaɪkləʊn; NAmE -kloʊn/ noun
a violent tropical storm in which strong winds move in a circle
—compare hurricane , typhoon
► cyc·lon·ic / saɪˈklɒnɪk; NAmE -ˈklɑːn-/ adjective
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WORD ORIGIN
mid 19th cent.: probably from Greek kuklōma wheel, coil of a snake, from kuklos circle. The change of spelling from -m to -n is unexplained.