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From Proto-Germanic *feþrō, whence also Old English feþer (English feather), Old Saxon fethara, Old High German fedara (German Feder). Ultimately from Proto-Indo-European *péth₂r̥ ~ pth₂én- (“feather, wing”), from *peth₂- (“to fly”).
Declension of fjǫðr (strong ō-stem)
- fiðri n (“plumage”)