mainspring

Noun
  1. The most important spring in a mechanical device (especially a clock or watch);
    As it uncoils it drives the mechanism (synset 103717983)
    is a type of: spring - a metal elastic device that returns to its shape or position when pushed or pulled or pressed
    is a part of: clockwork - any mechanism of geared wheels that is driven by a coiled spring; resembles the works of a mechanical clock

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