Definition of cogwheel noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkɒɡwiːl//
; NAmE NAmE//ˈkɑːɡwiːl//
(also cog)
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a wheel with a series of teeth on the edge that fit between the teeth on the next wheel and cause it to move
See the Oxford Advanced American Dictionary entry: cogwheel