Definition of bunion noun from the Oxford Advanced Learner's Dictionary

 

bunion

 noun
noun
BrE BrE//ˈbʌnjən//
 
; NAmE NAmE//ˈbʌnjən//
 
 
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a painful swelling on the foot, usually on the big toe Word Origin early 18th cent.: ultimately from Old French buignon, from buigne ‘bump on the head’.
See the Oxford Advanced American Dictionary entry: bunion