cyclone - (meteorology) rapid inward circulation of air masses about a low-pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southernmeteorology - the earth science dealing with phenomena of the atmosphere (especially weather) low, low pressure, depression - an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow" anticyclone - (meteorology) winds spiraling outward from a high-pressure center; circling clockwise in the northern hemisphere and counter-clockwise in the southern |