- loosely a windstorm with a violent, whirling movement; tornado or hurricane
- Meteorol. a system of rotating winds over a vast area, spinning inward to a low pressure center (counterclockwise in the N Hemisphere) and generally causing stormy weather: commonly called a low, since it coexists with low barometric pressure
Origin of cyclonealtered from cyclome ( from Classical Greek kykl?ma, wheel), influenced, influence by Classical Greek kykl?n, moving in a circle from kykloein, to circle around, whirl from kyklos: see wheel
- Meteorology a. An atmospheric system characterized by the rapid inward circulation of air masses about a low-pressure center, usually accompanied by stormy, often destructive weather. Cyclones circulate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.b. A violent tropical storm, especially one originating in the southwestern Pacific Ocean or Indian Ocean.
- A violent rotating windstorm, especially a tornado.
- Any of various devices using centrifugal force to separate materials.
Origin of cycloneFrom Greek kuklōn present participle of kukloun to rotate from kuklos circle ; see kwel-1 in Indo-European roots.
- cy·clon′ic cy·clon′i·cal
- A system of winds rotating around a center of low atmospheric pressure.
- A low pressure system.
- (popular) The more or less violent, small-scale circulations such as tornadoes, waterspouts, and dust devils.
- A strong wind.
- A Southeastern and Indian Ocean weather phenomenon that results in wind speeds of around 150 to 200 km/h.
Coined by Henry Piddington, probably in the 1840s, and based on some term in Ancient Greek. Sources disagree on the date and on which Ancient Greek term, though it had to be something derived from either κύκλος (kuklos, “circle, wheel”) or κυκλόω (kukloō, “go around in a circle, form a circle, encircle”).