Webster's English Dictionary

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cyclone

cy.clone \'si--.klo-n\ \si--'kla:n-ik\ \-i-k(*-)le-\ n [modif. of Gk 
   kyklo-ma wheel, coil, fr. kykloun to go around, fr]. kyklos circle 1: a 
   storm or system of winds that rotates about a center of low atmospheri c 
   pressure clockwise in the southern hemisphere and counterclockwise in the 
   northern, advances at a speed of 20 to 30 miles an hour, and often brings 
   abundant rain 2: TORNADO  - cy.clon.ic aj