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A localized swelling at either the medial or dorsal aspect of the first metatarsophalangeal joint, caused by an inflammatory bursa; a medial b. is usually associated with hallux valgus. [O.F. buigne, bump on the head]
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bun·ion 'bən-yən n an inflamed swelling of the small fluid-filled sac on the first joint of the big toe accompanied by enlargement and protrusion of the joint compare HALLUX VALGUS
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n.
a swelling of the joint between the great toe and the first metatarsal bone. A bursa often develops over the site and the great toe becomes displaced towards the others (hallux valgus). Bunions are usually caused by ill-fitting shoes and may require surgical treatment.
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bun·ion (bunґyən) [L. bunio; Gr. bounion turnip] abnormal prominence of the inner aspect of the first metatarsal head, accompanied by bursal formation and resulting in a lateral or valgus displacement of the great toe.
Bunion.
Medical dictionary. 2011.