Webster's English Dictionary

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anticyclone

an.ti.cy.clone \.ant-i-'si--.klo-n\ \-(.)si--'kla:n-ik\ n : a system of 
   winds that rotates about a center of high atmospheric pressu re clockwise 
   in the northern hemisphere and counterclockwise in the southern, that usu. 
   advances at 2 to 3 miles per hour, and that usu. has a diameter of 15 to 25 
   miles - an.ti.cy.clon.ic aj