Definitions

from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. A gear consisting of a spirally threaded shaft and a wheel with marginal teeth that mesh into it.
  • n. The toothed wheel of this gear; a worm wheel.

from the GNU version of the Collaborative International Dictionary of English

  • n. Worm gearing.

from The Century Dictionary and Cyclopedia

  • n. In machinery, a gearwheel of which the teeth are so formed that they are acted on and the wheel is made to revolve by a worm or shaft on which a spiral is turnedā€”that is, by an endless screw. See cuts under Hindley's screw (at screw), steam-engine, and odometer.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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

Etymologies

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