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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
1640-1650
1640-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for crown wheel

crown wheel

noun
1.
(horology) the wheel next to the winding knob that has one set of teeth at right angles to the other
2.
the larger of the two gears in a bevel gear
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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10
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