sprocket

[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; origin uncertain

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sprocket (ˈsprɒkɪt)
 
n
1.  Also called: sprocket wheel a relatively thin wheel having teeth projecting radially from the rim, esp one that drives or is driven by a chain
2.  an individual tooth on such a wheel
3.  a cylindrical wheel with teeth on one or both rims for pulling film through a camera or projector
4.  a small wedge-shaped piece of wood used to extend a roof over the eaves
 
[C16: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

sprocket
1530s, 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, © 2010 Douglas Harper
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Example sentences
The pinch points are located at the bottom and at the chain drive sprocket.
Operator shall be a side-mounted gear and sprocket mechanism located within the
  drive-end bracket.
Failure to completely guard chain and sprocket drives on machinery.
On bicycles the decal shall be affixed to the upright post attached to the
  sprocket facing in the forward direction.
Images for sprocket
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