Hypertext Webster Gateway: "hairspring"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hairspring \Hair"spring`\, n. (Horology)
The slender recoil spring which regulates the motion of the
balance in a timepiece.
From WordNet (r) 1.7 (wn)
hairspring
n : a fine spiral spring that regulates the movement of the
balance wheel in a timepiece
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