Definition of mainspring

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  • mainspring is a valid Scrabble US word with a point value of 15
  • mainspring is a valid Scrabble UK word with a point value of 15
  • mainspring is a valid Words with friends word with a point value of 20

Definition of mainspring

  • the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism (noun)

See definition of mainspring in Merriam Webster