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ratchet 音标拼音: [rættʃət] [r'ætʃət] n. 制轮装置;[防倒转的] 棘齿 制轮装置;[防倒转的] 棘齿 ratchet棘轮 ratchet n 1: mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction [ synonym: { ratchet}, { rachet}, { ratch}] v 1: move by degrees in one direction only; " a ratcheting lopping tool" [ synonym: { ratchet}, { rachet up}, { ratchet down}] Ratchet \ Ratch" et\ (-[ e^] t), n. [ Properly a diminutive from the same word as rack: cf. F. rochet. See 2d { Ratch}, { Rack} the instrument.] 1. A pawl, click, or detent, for holding or propelling a ratchet wheel, or ratch, etc. [ 1913 Webster] 2. A mechanism composed of a ratchet wheel, or ratch, and pawl. See { Ratchet wheel}, below, and 2d { Ratch}. [ 1913 Webster] { Ratchet brace} ( Mech.), a boring brace, having a ratchet wheel and pawl for rotating the tool by back and forth movements of the brace handle. { Ratchet drill}, a portable machine for working a drill by hand, consisting of a hand lever carrying at one end a drill holder which is revolved by means of a ratchet wheel and pawl, by swinging the lever back and forth. { Ratchet wheel} ( Mach.), a circular wheel having teeth, usually angular, with which a reciprocating pawl engages to turn the wheel forward, or a stationary pawl to hold it from turning backward. [ 1913 Webster] [ 1913 Webster] Note: In the cut, the moving pawl c slides over the teeth in one direction, but in returning, draws the wheel with it, while the pawl d prevents it from turning in the contrary direction. [ 1913 Webster] 18 Moby Thesaurus words for " ratchet": cog, comb, crag, fang, harrow, jag, peak, pecten, projection, rake, sawtooth, snag, snaggle, spire, sprocket, spur, steeple, tooth
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