HAIRSPRING

hairspring

(noun) a fine spiral spring that regulates the movement of the balance wheel in a timepiece

Source: WordNet® 3.1

Etymology

Noun

hairspring (plural hairsprings)

A spring, made of a coil of fine wire, that is used to regulate the movement of a balance wheel in a watch.

Source: Wiktionary

Hair"spring`, n. (Horology)

Definition: The slender recoil spring which regulates the motion of the balance in a timepiece.

Source: Webster’s Unabridged Dictionary 1913 Edition

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