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Definition of: ratchet
(rach′it) noun
1. A mechanism consisting of a notched wheel, the teeth of which engage with a pawl, permitting motion of the wheel in one direction only.
2. The pawl or the wheel thus used. Also ratchet wheel. [<F rochet spool <Ital. rochetto bobbin, dim. of rocca distaff <Gmc. Cf. OHG roccho spindle.]
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