Definitions
American Heritage® Dictionary of the English Language, Fourth 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.
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 turned—that is, by an endless screw. See cuts under Hindley's screw (at screw), steam-engine, and odometer.
GNU Webster's 1913
- n. (Mach.) Worm gearing.
WordNet 3.0
- 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
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