ETYM Greek from kyklos circle.
1. A violent rotating windstorm.
2. (Meteorology) Rapid inward circulation of air masses about a low-pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern.
Any storm in which wind is rotary; Meteorology, area of low pressure into which winds flow in anticlockwise direction in N hemisphere; hurricane; typhoon; erroneously tornado.
Alternate name for a depression, an area of low atmospheric pressure. A severe cyclone that forms in the tropics is called a tropical cyclone or hurricane.