fowl (n.) Look up fowl at
Old English fugel "bird, feathered vertebrate," from Proto-Germanic *fuglaz, the general Germanic word for "bird" (cognates: Old Saxon fugal, Old Frisian fugel, Old Norse fugl, Middle Dutch voghel, Dutch vogel, German vogel, Gothic fugls "a fowl, a bird"), perhaps a dissimilated form meaning literally "flyer," from PIE *pleuk- (see fly (v.1)).

Displaced in its original sense by bird (n.); narrower sense of "barnyard hen or rooster" (the main modern meaning) is first recorded 1570s; in U.S. this was extended to domestic ducks and geese.
fowl (v.) Look up fowl at
Old English fuglian "to catch birds," from the source of fowl (n.). Related: Fowled; fowling. Fowling-piece "gun used for shooting wildfowl" is from 1590s.