STY (4)

Sty, n. [[For older styan, styanye, understood as sty on eye, AS. stīgend (sc. eáge eye), properly, rising, or swelling (eye), p. p. of stīgan to rise. See Sty, v. i.]] (Med.) An inflamed swelling or boil on the edge of the eyelid. [Written also stye.]