bunion: [18] Bunion is probably a modification of the East Anglian dialect word bunny ‘lump, swelling’, representing a 15th-century form bony, glossed in a contemporary English-Latin dictionary as ‘great knob’. This was apparently borrowed from Old French hugne ‘bump on the head’.
1718, apparently from East Anglian dialectic bunny "lump, swelling" (16c.), which is probably from Middle French buigne "bump on the head, swelling from a blow" (see bun).
