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Chain wheel

 - 3 dictionary results

chain⋅wheel

[cheyn-hweel, -weel]
–noun Machinery.
sprocket (def. 1).

Origin:
1835–45; chain + wheel

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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Word Origin & History

sprocket 
1536, originally a carpenters' word for a piece of timber used in framing, of unknown origin. The meaning "projection from the rim of a wheel that engages the links of a chain" is first recorded 1750.
Online Etymology Dictionary, © 2001 Douglas Harper
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