crown wheel

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. 2014.
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World English Dictionary
crown wheel
 
n
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

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