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sprocket

[sprok-it] /ˈsprɒk ɪt/
noun
1.
Machinery.
  1. Also called chainwheel, sprocket wheel. a toothed wheel engaging with a conveyor or power chain.
  2. 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 of sprocket
1530-1540
First recorded in 1530-40; origin uncertain
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for sprocket

sprocket

/ˈsprɒkɪt/
noun
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
Word Origin
C16: of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for 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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16
18
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