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[sahy-klohn] /ˈsaɪ kloʊn/
a large-scale, atmospheric wind-and-pressure system characterized by low pressure at its center and by circular wind motion, counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere.
(not in technical use) tornado.
Also called cyclone collector, cyclone separator. Machinery. a device for removing small or powdered solids from air, water, or other gases or liquids by centrifugal force.
Origin of cyclone
term introduced by British meteorologist Henry Piddington (1797-1858) in 1848, perhaps < Greek kyklôn revolving (present participle of kykloûn to revolve, verbal derivative of kýklos; see cycle); apparently confused by Piddington with kýklōma wheel, snake's coil
Related forms
minicyclone, noun
precyclone, noun
Can be confused Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for cyclone


another name for depression (sense 6)
a violent tropical storm; hurricane
Derived Forms
cyclonic (saɪˈklɒnɪk), cyclonical, cyclonal, adjective
cyclonically, adverb
Word Origin
C19: from Greek kuklōn a turning around, from kukloein to revolve, from kuklos wheel


trademark (Austral & NZ) (of fencing) made of interlaced wire and metal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cyclone

1848, coined by British East India Company official Henry Piddington to describe the devastating storm of December 1789 in Coringa, India; irregularly formed from Greek kyklon "moving in a circle, whirling around," present participle of kykloun "move in a circle, whirl," from kyklos "circle" (see cycle (n.)). Applied to tornados from 1856.

Online Etymology Dictionary, © 2010 Douglas Harper
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cyclone in Science
  1. A large-scale system of winds that spiral in toward a region of low atmospheric pressure. A cyclone's rotational direction is opposite to that of an anticyclone. In the Northern hemisphere, a cyclone rotates counterclockwise; in the Southern hemisphere, clockwise. Because low-pressure systems generally produce clouds and precipitation, cyclones are often simply referred to as storms. ◇ An extratropical cyclone is one that forms outside the tropics at middle or high latitudes. Extratropical cyclones usually have an organized front and migrate eastward with the prevailing westerly winds of those latitudes. ◇ A tropical cyclone forms over warm tropical waters and is generally smaller than an extratropical cyclone. Such a system is characterized by a warm, well-defined core and can range in intensity from a tropical depression to a hurricane. Compare anticyclone.

  2. A small-scale, violently rotating windstorm, such as a tornado or waterspout. Not in scientific use.

Our Living Language  : Technically, a cyclone is nothing more than a region of low pressure around which air flows in an inward spiral. In the Northern Hemisphere the air moves counterclockwise around the low-pressure center, and in the Southern Hemisphere the air travels clockwise. Meteorologists also refer to tropical cyclones, which are cyclonic low-pressure systems that develop over warm water. For a tropical cyclone to originate, a large area of ocean must have a surface temperature greater than 27 degrees Celsius (80.6 degrees Fahrenheit). Tropical cyclones are categorized based on the strength of their sustained surface winds. They may begin as a tropical depression, with winds less than 39 miles (63 kilometers) per hour. Tropical storms are identified and tracked once the winds exceed this speed. Severe tropical cyclones, with winds of 74 miles (119 kilometers) per hour or greater, are better known as hurricanes when they occur in the Atlantic Ocean and Gulf of Mexico, or as typhoons when they happen in the Pacific Ocean. Because the word cyclone broadly defines a kind of air flow, cyclones are not confined to our planet. In 1999 the Hubble Space Telescope photographed a cyclone more than 1,610 kilometers (1,000 miles) across in the northern polar regions of Mars.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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cyclone in Culture

cyclone definition

Any circular wind motion. A region of low atmospheric pressure. Also, a tropical storm.

Note: Cyclones can be a few feet across (“dust devils”) or can be major storm systems such as hurricanes, tornadoes, and typhoons.
Note: These winds move counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. (See Coriolis effect.)
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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