Unruhfeder

== German == === Etymology === Unruh +‎ Feder === Noun === Unruhfeder f (genitive Unruhfeder, plural Unruhfedern) (watches) balance spring, hairspring Synonym: Spiralfeder ==== Declension ==== === Further reading === “Unruhfeder” in Digitales Wörterbuch der deutschen Sprache