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

 

aneurysm

 noun
noun
BrE BrE//ˈænjərɪzəm//
 
; NAmE NAmE//ˈænjərɪzəm//
 
(medical)
 
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an area of extreme swelling on the wall of an artery Word Origin late Middle English: from Greek aneurusma ‘dilatation’, from aneurunein ‘widen out’.
See the Oxford Advanced American Dictionary entry: aneurysm