hairspring

hairspring

[hair-spring]
noun Horology.
a fine, usually spiral, spring used for oscillating the balance of a timepiece.
Also called balance spring.


Origin:
1820–30; hair + spring

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World English Dictionary
hairspring (ˈhɛəˌsprɪŋ)
 
n
horology a very fine spiral spring in some timepieces, which, in combination with the balance wheel, controls the timekeeping

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