a fine, usually spiral, spring used for oscillating the balance of a timepiece.
- Also called balance spring.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use hairspring in a sentence
If this is a balance pivot, be very careful to see that your balance is true and poised before putting on hairspring and roller.
The hairspring stud E is of steel, shaped as shown, and comes outlined with the other parts.
We refer to arranging and disposing of the impulse of the escape wheel to meet the resistance of the hairspring.
As we set the bankings the pallets are all right; but to test matters, let us remove the hairspring and put the balance in place.
The Curb Pins sometimes produce the ferric oxide mentioned by their action on the hairspring.Friction, Lubrication and the Lubricants in Horology | William T. Lewis
British Dictionary definitions for hairspring
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