a circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere. Compare cyclone(def. 1), high(def. 37).
an·ti·cy·clone (ān'tē-sī'klōn', ān'tī-) n. An extensive system of winds spiraling outward from a high-pressure center, circling clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. an'ti·cy·clon'ic (-klŏn'ĭk) adj.