bunion

[buhn-yuhn]
noun Podiatry.
inflammation of the synovial bursa of the great toe, usually resulting in enlargement of the joint and lateral displacement of the toe.

Origin:
1710–20; perhaps alteration of bunny (obsolete) lump, swelling, late Middle English bony, probably alteration of Old French buigne, buyne (French beigne) swelling, of Germanic orig.; cf. beignet

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World English Dictionary
bunion (ˈbʌnjən)
 
n
swelling of the first joint of the big toe, which is displaced to one side. An inflamed bursa forms over the joint
 
[C18: perhaps from obsolete bunny a swelling, of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

bunion
1718, from E.Anglian dialectic bunny "lump, swelling" (16c.), from M.Fr. buigne "bump on the head" (see bun).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bunion bun·ion (bŭn'yən)
n.
A localized swelling at either the medial or dorsal aspect of the first joint of the big toe, caused by an inflamed bursa.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

bunion

type of bursitis that appears as a bulge covered by thickened skin occurring at the base of the big toe, where friction against the side of the shoe takes place. The protuberance is due to a swelling of the bursa mucosa, a closed sac filled with a clear, lubricating fluid. The bunion causes pain, localized tenderness, and limitation of motion, and it results in permanent deformation, forcing the toe toward the little toe.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
People with bunions often develop a callus over the bunion because it rubs
  against the shoe.
The risk is increased when the toes are already crowded by the pressure of a
  bunion.
Even direct impressions are painted over with gilding, as if to perfect their
  shape, eliminate evidence of the unsightly bunion.
After having a bunion surgery, patients are given a pain medicine injection
  that may last for up to several days or a placebo.
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