Hypertext Webster Gateway: "cyclone"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Cyclone \Cy"clone\, n.
1. (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.
2. A tornado. See above, and {Tornado}. [Middle U. S.]
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Cyclone \Cy"clone\ (s?"kl?n), n. [Gr.????? moving in a circle,
p. pr. of ?????, fr. ky`klos circle.] (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.
Note: The atmospheric disturbance usually accompanying a
cyclone, marked by an onward moving area of high
pressure, is called an anticyclone.
From WordNet (r) 1.7 (wn)
cyclone
n 1: (meteorology) rapid inward circulation of air masses about a
low-pressure center; circling counterclockwise in the
northern hemisphere and clockwise in the southern [ant:
{anticyclone}]
2: a violent rotating windstorm
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