Hairspring definitions

hâr'sprĭng'
A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
noun
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A very slender, spiral spring that controls the regular movement of the balance wheel in a watch or clock.
noun
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A spring, made of a coil of fine wire, that is used to regulate the movement of a balance wheel in a watch.
noun
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Origin of hairspring