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sprocket

 - 2 dictionary results

sprock⋅et

[sprok-it]
–noun
1. Machinery.
a. Also called chainwheel, sprocket wheel. a toothed wheel engaging with a conveyor or power chain.
b. one tooth of such a wheel.
2. Carpentry. a wedge-shaped piece of wood extending a sloping roof over the eaves with a flatter pitch.

Origin:
1530–40; orig. uncert.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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sprock·et   (sprŏk'ĭt)   
n.  
  1. Any of various toothlike projections arranged on a wheel rim to engage the links of a chain.

  2. A cylinder with a toothed rim that engages in the perforations of photographic or movie film to pull it through a camera or projector.


[Origin unknown.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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