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A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Horology) horology a very fine spiral spring in some timepieces, which, in combination with the balance wheel, controls the timekeeping
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



a fine, usu. spiral, spring used for oscillating the balance of a timepiece.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hairspring - a fine spiral spring that regulates the movement of the balance wheel in a timepiecehairspring - a fine spiral spring that regulates the movement of the balance wheel in a timepiece
spiral spring - a spring that is wound like a spiral
horologe, timepiece, timekeeper - a measuring instrument or device for keeping time
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˈhɛəsprɪŋ] Nmuelle m espiral muy fino (de un reloj)
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
References in periodicals archive ?
The 42mm timepiece boasts the latest in-house Isograph hairspring movement and is available with a blue, black or grey smoked dial with rhodium-plated indexes and hands filled with SuperLuminova.
If not, the hairspring within the balance wheel could become damaged and your watch could start losing or gaining time rapidly, or even stop.
This includes two vital components - the balance and the hairspring, which is the heart of a mechanical watch.
Consider that the Baumatic calibre featured a silicon hairspring -- the first silicon hairspring made by the Richemont group.
Through the optimization of its barrel, escapement and hairspring, it offers no fewer than five full days, or 120 hours, of power reserve.
[[nid:2598357]]Mechanical watches have operated on the same basic principle-with myriad tweaks, developments and flourishes, to be sure-since the 17th century, when Christiaan Huygens presented a clock with a coupled balance and hairspring. With the Defy Lab, Zenith upends the very foundation of mechanical horology, presenting an oscillator that operates according to brand-new rules.
An optimized blue Parachrom hairspring is fitted to the oscillator, the true heart of the watch.
2005 -- Rolex creates the blue Parachrom hairspring. Crafted from a paramagnetic alloy, it is unaffected by magnetic fields and up to 10 times more resistant to shocks.