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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

hairspring

Noun

hair=spring

WORDNET DICTIONARY

hairspring(n = noun.artifact) Array - a fine spiral spring that regulates the movement of the balance wheel in a timepiece; Array

is a part of horologe, timekeeper, timepiece

hairspring, n.

The slender recoil spring which regulates the motion of the balance in a timepiece. [1913 Webster]

hairspring, n. a fine spring regulating the balance-wheel in a watch.

For further exploring for "hairspring" in Webster Dictionary Online