Meaning

noun an infection of the sebaceous gland of the eyelid

noun a pen for swine

originFrom Middle English sty, from Old English stī, stiġ (“sty, pen, a wooden enclosure; hall”, chiefly in compounds). 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”).

Etymology from Wiktionary, CC BY-SA 3.0