ヒゲゼンマイ
ヒ
ゲ
ゼ
ン
マ
イ
Meanings
1
balance spring; hairspring
usually written using kana alone
A very thin spiral spring used in mechanical watches and clocks to regulate the oscillation of the balance wheel.
A hairspring is used in the heart of a mechanical watch.
If the hairspring breaks, the watch stops working.