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downburst

[doun-burst] /ˈdaʊnˌbɜrst/
noun
1.
a strong downward current of air from a cumulonimbus cloud, often associated with intense thunderstorms.
Origin
down1 + burst
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for down-burst

downburst

/ˈdaʊnˌbɜːst/
noun
1.
a very high-speed downward movement of turbulent air in a limited area for a short time. Near the ground it spreads out from its centre with high horizontal velocities Also called microburst
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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down-burst in Science
downburst
  (doun'bûrst')   
An extremely powerful downward air current from a cumulonimbus cloud, typically associated with thunderstorm activity. Downbursts can produce effects that resemble those brought about by tornadoes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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9
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