[pin-hweel, -weel]
a child's toy consisting of a wheel or leaflike curls of paper or plastic loosely attached by a pin to a stick, designed to revolve when blown by or as by the wind.
Also called catherine wheel. a kind of firework supported on a pin which, when ignited, revolves rapidly and gives a dazzling display of light.
a wheel having pins at right angles to its rim for engaging the teeth of a gear.
verb (used without object)
to revolve rapidly like a pinwheel: Images of the past pinwheeled through his mind.
Also, pin wheel.

1695–1705; pin + wheel Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pinwheel (ˈpɪnˌwiːl)
1.  another name for Catherine wheel
2.  a cogwheel whose teeth are formed by small pins projecting either axially or radially from the rim of the wheel
3.  (US), (Canadian) windmill, Also called (in Britain and certain other countries): whirligig a toy consisting of plastic or paper vanes attached to a stick in such a manner that they revolve like the sails of a windmill

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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Example sentences
Hundreds of swifts, rock doves, and even a few raptors pinwheel inside.
How they toured the campus on identical bicycles, one with a pinwheel on its handlebars.
The spider surveyed its universe, but everything beyond that gossamer pinwheel was incomprehensible.
The campaign is built around the symbol of the pinwheel.
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