ratchet wheel ( synonym found)
Definition of ratchet wheel:

°A toothed wheel either held in position or turned by an engaging detent or pawl.
°The retaining wheel over the mainspring arbor of a timepiece.
Definition of ratchet wheel:

°A toothed wheel either held in position or turned by an engaging detent or pawl.
°The retaining wheel over the mainspring arbor of a timepiece.
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