Watch regulator

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Wheel \Wheel\ (hw[=e]l), n. [OE. wheel, hweol, AS. hwe['o]l, hweogul, hweowol; akin to D. wiel, Icel. hv[=e]l, Gr. ky`klos, Skr. cakra; cf. Icel. hj[=o]l, Dan. hiul, Sw. hjul. A circular frame turning about an axis; a rotating disk, whether solid, ...

WordNet Word definitions in WordNet
n. a wheel that regulates the rate of movement in a machine; especially a wheel oscillating against the hairspring of a timepiece to regulate its beat [syn: balance ]

Wikipedia Word definitions in Wikipedia
A balance wheel , or balance , is the timekeeping device used in mechanical watches and some clocks , analogous to the pendulum in a pendulum clock . It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral ...

Wiktionary Word definitions in Wiktionary
n. The timekeeping device normally used in mechanical watches and small clocks. Consisting of a wheel which oscillates due to a coiled spring.