German edit

Etymology edit

Unruh +‎ Feder

Noun edit

Unruhfeder f (genitive Unruhfeder, plural Unruhfedern)

  1. (watches) balance spring, hairspring
    Synonym: Spiralfeder

Declension edit

Further reading edit

  • Unruhfeder” in Digitales Wörterbuch der deutschen Sprache