English > gear wheel: 1 sense > noun 1, artifact| Meaning | A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion. |
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| Synonyms | gear, geared wheel, cogwheel |
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| Parts | cog, sprocket | tooth on the rim of gear wheel |
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| tooth | One of a number of uniform projections on a gear |
| Narrower | bevel gear, pinion and crown wheel, pinion and ring gear | gears that mesh at an angle |
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| escape wheel | gear that engages a rocking lever |
| pinion | A gear with a small number of teeth designed to mesh / mesh with a larger / larger wheel or rack |
| planetary gear, epicyclic gear, planet wheel, planet gear | An outer gear that revolves about a central sun gear of an epicyclic train |
| rack and pinion | A wheel gear (the pinion) meshes / meshes with a toothed rack |
| spur gear, spur wheel | gear wheels that mesh / mesh in the same plane |
| sun gear | The central gear in an epicyclic train |
| worm gear | gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel) |
| worm wheel | gear with the thread of a worm |
| Broader | 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) |
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| Spanish | engranaje, rueda dentada |
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| Catalan | roda dentada |
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