Definition of hairspring in English:

hairspring

Syllabification: hair·spring
Pronunciation: /ˈhe(ə)rˌspriNG
 
/

noun

  • A slender flat coiled spring regulating the movement of the balance wheel in a watch.
    More example sentences
    • This oscillation is not exactly a parallel to the balance wheel and hairspring of a clockwork watch, but the fact is that both use oscillations to keep track of passing time.
    • The curb pins on the regulator must be adjusted so that the hairspring hits them when it is supposed to.
    • In most cases they used a long extension of the hairspring and pinned it to the base of the balance cock.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody