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cogwheel
cog·wheel [ kóg wl, kóg hwl ] (plural cog·wheels)


noun 
Definition:
 
toothed wheel: a wheel with a series of projections around the rim that enable it to engage with projections on another wheel or rack to create traction and so produce motion
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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