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3 definitions found
 for Cyclone
From The Collaborative International Dictionary of English v.0.48 :

  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.] Cyclone cellar

From WordNet (r) 3.0 (2006) :

      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:
      2: a violent rotating windstorm

From Moby Thesaurus II by Grady Ward, 1.0 :

  65 Moby Thesaurus words for "cyclone":
     air mass, anticyclone, baguio, blaze, burst, cold front,
     cold sector, convulsion, dirty weather, dust devil, eruption,
     explosion, fit, flare-up, foul weather, front, gale, gust, high,
     high-pressure area, hurricane, irruption, isobar, isometric,
     isometric line, isopiestic line, isotherm, isothermal line,
     line squall, low, low-pressure area, occluded front, outbreak,
     outburst, paroxysm, polar front, rainspout, rainstorm,
     rotary storm, rough weather, sand column, sandspout, seizure,
     snowstorm, spasm, squall, squall line, stationary front, storm,
     stormy weather, tempest, tempestuous rage, thunderstorm, tornado,
     twister, typhoon, upheaval, warm front, waterspout, weather map,
     whirlblast, whirlwind, wind eddy, wind-shift line, windstorm

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