单词 | overcoil |
释义 | overcoil/ˈəʊvəkɔɪl/Watchmaking and Clockmaking noun The last coil of a Breguet hairspring, having the outer quarter turn raised and curved towards the centre to improve timekeeping. OriginLate 19th century; earliest use found in Frederick Britten (1843–1913). From over- + coil. |
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