worm gear

Noun
  1. 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 (synset 104612164)
    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
    has:
    • worm - screw thread on a gear with the teeth of a worm wheel or rack
    • worm wheel - gear with the thread of a worm

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