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hairspring

 
Dictionary: hair·spring   (hâr'sprĭng') pronunciation

n.
A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.


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WordNet: hairspring
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The noun has one meaning:

Meaning #1: a fine spiral spring that regulates the movement of the balance wheel in a timepiece


 
 
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balance spring (horology)
regulator pin (horology)
regulator

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more