Bunyon \Bun"yon\, Bunion \Bun"ion\, 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 burs[ae] muscos[ae]), usually occurring on the
first joint of the great toe.
[1913 Webster]