balance wheel

Noun
  1. 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 (synset 102780407)
    is a type of: wheel - a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
    is a part of: horologe, timekeeper, timepiece - a measuring instrument or device for keeping time
    same as: balance

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