ratchet wheel

noun
a wheel, with teeth on the edge, into which a pawl drops or catches, as to prevent reversal of motion or convert reciprocating motion into rotatory motion.

Origin:
1770–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The significant inputs of a ratchet consist of a handle forging, a toothed ratchet wheel, and a reversible pawl.
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