cyclone

[ sahy-klohn ]

noun

1. Meteorology. 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. Compare anticyclone, extratropical cyclone, subtropical cyclone, tropical cyclone.
2. (not in technical use) tornado ( def 1 ).
3. Also called cy·clone col·lec·tor [sahy, -klohn k, uh, -lek-ter], Machinery. a device for removing small or powdered solids from air, water, or other gases or liquids by centrifugal force.

Cyclone

¹

/ ˈsaɪkləʊn /

adjective

1. (of fencing) made of interlaced wire and metal

cyclone

²

/ saɪˈklɒnɪk; ˈsaɪkləʊn /

noun

1. another name for depression
2. a violent tropical storm; hurricane

cyclone

/ sī′klōn′ /

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.
2. ◆ 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.
3. ◆ 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.
4. Compare anticyclone
5. A small-scale, violently rotating windstorm, such as a tornado or waterspout. Not in scientific use.

cyclone

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

Notes

These winds move counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere . ( See Coriolis effect .)

Cyclones can be a few feet across (“dust devils”) or can be major storm systems such as hurricanes , tornadoes , and typhoons .

Derived Forms

• cyclonic, adjective
• cyˈclonically, adverb

Other Words From

• min·i·cy·clone noun
• pre·cy·clone noun

Word History and Origins

Origin of cyclone¹

Introduced by British meteorologist Henry Piddington (1797–1858) in 1848, perhaps from Greek kyklôn “revolving” (present participle of kykloûn “to revolve,” verbal derivative of kýklos “wheel, ring, circle”; cycle ); apparently confused by Piddington with kýklōma “wheel, snake's coil”

Word History and Origins

Origin of cyclone¹

C19: from Greek kuklōn a turning around, from kukloein to revolve, from kuklos wheel

A Closer Look

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.

Example Sentences

Thousands of relief workers have been deployed to minimise damage from Cyclone Dana, which is expected to make landfall in the next 24 hours.

From BBC

Last year, at least 16 people lost their lives when a cyclone lashed India and Bangladesh.

From BBC

On Wednesday, Odisha Chief Minister Mohan Charan Majhi said arrangements were in place to ensure the safety of residents in districts along the cyclone’s path.

From BBC

In 1999, more than 10,000 people were killed in a cyclone in Odisha.

From BBC

“We are looking at relatively enhanced odds of tropical cyclone formations in the western Caribbean, south of Cuba,” Rosencrans said.

From Los Angeles Times

Related Words

• monsoon
• tropical cyclone
• tropical storm
• typhoon