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Definitions of mainspring
  1. noun
    the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism
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Definition that contains mainspring
  • fusee drive a spirally grooved spindle in a clock that counteracts the diminishing power of the uncoiling mainspring
  • fusee a spirally grooved spindle in a clock that counteracts the diminishing power of the uncoiling mainspring
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