worm wheel

Noun
  1. Gear with the thread of a worm (synset 104612415)
    is a type of: 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
    is a part of: 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

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