cog wheel

cogwheel

[kog-hweel, -weel]
noun
(not in technical use) a gearwheel, especially one having teeth of hardwood or metal inserted into slots.

Origin:
1375–1425; late Middle English; see cog1, wheel

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World English Dictionary
cogwheel (ˈkɒɡˌwiːl)
 
n
another name for gearwheel

Collins English Dictionary - Complete & Unabridged 10th Edition
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