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crown wheel

 - 1 dictionary result

crown wheel

–noun Horology.
1. a wheel next to the winding knob, having two sets of teeth, one at right angles to its plane.
2. any of various wheels having the form of a hoop or short cylinder with a serrated edge, as the escape wheel in a verge escapement.

Origin:
1640–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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