[hwurl-wind, wurl-]
any of several relatively small masses of air rotating rapidly around a more or less vertical axis and advancing simultaneously over land or sea, as a dust devil, tornado, or waterspout.
anything resembling a whirlwind, as in violent action or destructive force.
any circling rush or violent onward course.
like a whirlwind, as in speed or force: a whirlwind visit to New York.
verb (used without object)
to move or travel quickly.
reap the whirlwind, to suffer the penalties for one's misdeeds. Hos. 8:7.

1300–50; Middle English < Old Norse hvirfilvindr; cognate with German Wirbelwind

4. headlong, breakneck, hasty, impulsive.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
whirlwind (ˈwɜːlˌwɪnd)
1.  a column of air whirling around and towards a more or less vertical axis of low pressure, which moves along the land or ocean surface
2.  a.  a motion or course resembling this, esp in rapidity
 b.  (as modifier): a whirlwind romance
3.  an impetuously active person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

Whirlwind definition

An early computer from the MIT Research Laboratory for Electronics.
Whirlwind used electrostatic memory and ran Laning and Zierler (1953); and ALGEBRAIC, COMPREHENSIVE and SUMMER SESSION (all 1959).
[Details, reference?]
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica


a small-diameter columnar vortex of rapidly swirling air. A broad spectrum of vortices occurs in the atmosphere, ranging in scale from small eddies that form in the lee of buildings and topographic features to fire storms, waterspouts, and tornadoes. While the term whirlwind can be applied to any atmospheric vortex, it is commonly restricted to atmospheric systems that are smaller than tornadoes but larger than eddies of microscale turbulence. The generic whirlwind is usually modified to reflect the visible features associated with the whirl; thus there are dust whirls or dust devils, sand whirls or sand pillars, and fire, smoke, snow, and even hay whirls.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
She replies directly to him, and a whirlwind e-romance begins.
Many other reforms launched in the whirlwind first year do not go as far as promised.
In that whirlwind, a lot of companies didn't survive.
In the whirlwind, he said his accomplishment had hardly sunk in.
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