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worm gear
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Tweet n. 1. A gear consisting of a spirally threaded shaft and a wheel with marginal teeth that mesh into it. 2. The toothed wheel of this gear; a worm wheel.  (click for a larger image) worm gearworm gear assembly |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
