Pronunciation: (wij'un),[key] —n., —pl.-eons,(esp. collectively)-eonfor 1. 1. any of several common freshwater ducks related to the mallards and teals in the genus Anas, having metallic green flight feathers, a white wing patch, and a buff or white forehead, including A. penelope of Eurasia and North Africa, A. sibilatrix of South America, and the baldpate, A. americana, of North America.
2. Obs.a fool. Also,wigeon.