Main Entry: an·ti·cy·clone

Pronunciation: \ˌan-ti-ˈsī-ˌklōn\

Function: noun

Date: 1862

1 : a system of winds that rotates about a center of high atmospheric pressure clockwise in the northern hemisphere and counterclockwise in the southern, that usually advances at 20 to 30 miles (about 30 to 50 kilometers) per hour, and that usually has a diameter of 1500 to 2500 miles (2400 to 4000 kilometers)
2 : high 2

— an·ti·cy·clon·ic \-sī-ˈklä-nik\ adjective