| NOUN | artifact | worm gear | gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel) |
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| Meaning | 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. | |
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| Parts | worm | screw thread on a gear with the teeth of a worm wheel or rack |
| worm wheel | gear with the thread of a worm | |
| Broader | gear, gear wheel, geared wheel, cogwheel | A toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion |
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