CYCLONE
cyclone
(noun) a violent rotating windstorm
cyclone
(noun) (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern
Source: WordNet® 3.1
Etymology
Noun
cyclone (plural cyclones)
(broad sense) A weather phenomenon consisting of a system of winds rotating around a center of low atmospheric pressure
(narrow sense) Such weather phenomenon occurring in the South Pacific and Indian Ocean
A low pressure system.
(informal) The more or less violent, small-scale circulations such as tornadoes, waterspouts, and dust devils.
A strong wind.
A cyclone separator; the cylindrical vortex tube within such a separator
Source: Wiktionary
Cy"clone (s"kln), n. Etym: [Gr. (Meteor.)
Definition: A violent storm, often of vast extent, characterized by high
winds rotating about a calm center of low atmospheric pressure. This
center moves onward, often with a velocity of twenty or thirty miles
an hour.
Note: The atmospheric disturbance usually accompanying a cyclone,
marked by an onward moving area of high pressure, is called an
anticyclone.
Source: Webster’s Unabridged Dictionary 1913 Edition