American Heritage® Dictionary of the English Language, Fourth Edition
- n. The toothed wheel of a worm gear.
Century Dictionary and Cyclopedia
- n. A wheel which gears with an endless or tangent screw or worm, receiving or imparting motion. By this means a powerful effect with a diminished rate of motion is communicated from one revolving shaft to another. See
tangent screw(under tangent), endless screw (under endless, with cut); also cuts under Hindley's screw(at screw) and under steam-engine.
GNU Webster's 1913
- n. a cogwheel having teeth formed to fit into the spiral spaces of a screw called a
worm, so that the wheel may be turned by, or may turn, the worm; -- called also worm gear, and sometimes tangent wheel. See Illust.of Worm gearing, above.
- n. gear with the thread of a worm
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