Balance wheel

noun

Definitions

Noun
  1. 1
    The timekeeping device normally used in mechanical watches and small clocks, consisting of a wheel which oscillates due to a coiled spring.

    "A mantelpiece clock with rackety balance wheel makes the only sound."

  2. 2
    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 wordnet

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