| gear wheel | | |
| n. (artifact) | 1. cogwheel, gear, gear wheel, geared wheel | a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion. |
| ~ bevel gear, pinion and crown wheel, pinion and ring gear | gears that mesh at an angle. |
| ~ cog, sprocket | tooth on the rim of gear wheel. |
| ~ escape wheel | gear that engages a rocking lever. |
| ~ pinion | a gear with a small number of teeth designed to mesh with a larger wheel or rack. |
| ~ epicyclic gear, planet gear, planet wheel, planetary gear | an outer gear that revolves about a central sun gear of an epicyclic train. |
| ~ rack and pinion | a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa). |
| ~ spur gear, spur wheel | gear wheels that mesh in the same plane. |
| ~ sun gear | the central gear in an epicyclic train. |
| ~ tooth | one of a number of uniform projections on a gear. |
| ~ wheel | a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines). |
| ~ worm gear | gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion. |
| ~ worm wheel | gear with the thread of a worm. |
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