hairspring

[hair-spring]

hair·spring

[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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hairspring is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
Collins
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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