Cyclone

Cyclone
Cyclone Cy"clone (s?"kl?n), n. [Gr.????? moving in a circle, p. pr. of ?????, fr. ky`klos circle.] 1. (Meteor.) 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. [1913 Webster]

Note: The atmospheric disturbance usually accompanying a cyclone, marked by an onward moving area of high pressure, is called an anticyclone. [1913 Webster]

2. (Meteor.) In general, a condition of the atmosphere characterized by a central area of pressure much lower than that of surrounding areas, and a system of winds blowing inward and around (clockwise in the southern hemisphere and counter-clockwise in the northern); -- called also a {low-area storm}. It is attended by high temperature, moist air, abundant precipitation, and clouded sky. The term includes the hurricane, typhoon, and tropical storms; it should not be applied to the moderate disturbances attending ordinary areas of low pressure nor to tornadoes, waterspouts, or ``twisters,'' in which the vertical motion is more important than the horizontal. [Webster 1913 Suppl.]

3. A tornado. See above, and {Tornado}. [Middle U. S.] [Webster 1913 Suppl.]


The Collaborative International Dictionary of English. 2000.

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