Bunion | { } n. [ Cf. Prov. E. bunny a small swelling, fr. OF. bugne, It. bugna, bugnone. See Bun. ] (Med.) An enlargement and inflammation of a small membranous sac (one of the bursæ muscosæ), usually occurring on the first joint of the great toe. [ 1913 Webster ] Variants: Bunyon |