crown wheel

/K R AW1 N W IY0 L/
noun
  1. 1

    In watchmaking, an object of circular shape with contrate teeth, which meshes with the winding pinion and with the ratchet-wheel on the barrel-arbor used to wind-up the watch, respectively, to set the time.

Translate “crown wheel” into another language

Source: https://en.wiktionary.org/wiki/crown%20wheel