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[sprok-it] /ˈsprɒk ɪt/
  1. Also called chainwheel, sprocket wheel. a toothed wheel engaging with a conveyor or power chain.
  2. one tooth of such a wheel.
Carpentry. a wedge-shaped piece of wood extending a sloping roof over the eaves with a flatter pitch.
Origin of sprocket
1530-40; origin uncertain Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for sprocket
  • 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.
  • Crawler crane means equipment that has a type of base mounting which incorporates a continuous belt of sprocket driven track.
  • They may have a sprocket mounted in the tip or a solid tip.
  • The flow is controlled by a sprocket-driven belt that feeds the dry fertilizer into the spreader.
  • The planetary shaft extends through a planetary sprocket which turns the chain that propels the continuous miner.
  • The belt twisted and slipped when wet and was replaced by a chain-and-sprocket drive.
  • The tower was electrically powered with a chain, belt, and sprocket wheel system.
British Dictionary definitions for sprocket


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
an individual tooth on such a wheel
a cylindrical wheel with teeth on one or both rims for pulling film through a camera or projector
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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