Webster's Revised Unabridged Dictionary · 1913

Hairspring

Hairspring (-spring`) , noun

(Horology) The slender recoil spring which regulates the motion of the balance in a timepiece.

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

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