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overcoil

[oh-ver-koil] /ˈoʊ vərˌkɔɪl/
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.
Origin
1880-1885
1880-85; over- + coil1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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