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单词 overcoil
释义

overcoil in American English

(ˈouvərˌkɔil)
noun Horology
1. 
a fixed end of a spiral hairspring, consisting of an upwardly and inwardly bent continuation of the outermost coil of the spring: used to offset the asymmetry of the common spiral spring when tight, which impairs isochronism
2. 
a hairspring having such a fixed end
Word origin
[1880–85; over- + coil1]
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