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bunion (n.)

"swelling on the foot caused by inflammation of a bursa," 1718, apparently from East Anglian dialectic bunny "lump, swelling" (16c.), which is probably from French buigne "bump on the head, swelling from a blow" (see bun).

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Definitions of bunion from WordNet

bunion (n.)
a painful swelling of the bursa of the first joint of the big toe;
From wordnet.princeton.edu