hairspring

[hair-spring]
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noun Horology.

a fine, usually spiral, spring used for oscillating the balance of a timepiece.

Origin of hairspring

First recorded in 1820–30; hair + spring
Also called balance spring.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for hairspring

hairspring

noun

horology a very fine spiral spring in some timepieces, which, in combination with the balance wheel, controls the timekeeping
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012