sty

From Middle English sty, from Old English stī, stiġ (“sty, pen, a wooden enclosure; hall”, chiefly in compounds), from Proto-West Germanic *stī, from Proto-Germanic *stiją.

Cognate with German Stiege (“wooden crate”), dialectal German Steige (“hen-coop”), Danish sti (“sty, enclosure for swine, sheep, hens, etc.”), Swedish stia (“sty for pigs, geese, etc.”), Norwegian sti (“flock of sheep”), Icelandic stía (“a kennel”).

From Middle English styanye, mistaken as "sty on eye" yet composed of Old English stīġend (“sty”, literally “riser”), agent noun from stīgan (“to rise”) + Middle English yë (“eye”).