# hairspring

> English word · Noun

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

## Etymology
From hair + spring.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hairspring