crown wheel

WordReference Random House Unabridged Dictionary of American English © 2026

crown′ wheel′, [Horol.]

1. Time a wheel next to the winding knob, having two sets of teeth, one at right angles to its plane.
2. Time 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.

• 1640–50

Collins Concise English Dictionary © HarperCollins Publishers::

crown wheel noun

1. 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