hairspring Hear it!

hairspring definition

hair·spring (her′spriŋ′)

noun

a very slender, spiral spring that controls the regular movement of the balance wheel in a watch or clock

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.