From Old High German gifugili. The expected modern form is *Gefügel, a collective form pertaining to Vogel (“bird”), cf. similar Dutch gevogelte. The connection with Vogel was lost in German and the word was at some point re-interpreted as Geflügel, that is “animals with wings”. Cf. Flügel (“wing”).
Geflügel n (genitive Geflügels, no plural)
- poultry (birds)
- Geflügel in Duden online