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overcoil

[ oh-ver-koil ]
/ ˈoʊ vərˌkɔɪl /
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noun Horology.
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.
a hairspring having such a fixed end.
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Origin of overcoil

First recorded in 1880–85; over- + coil1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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