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An aneurysm or aneurism (from Greek: á¼Î½ÎµÏÏÏÏÎ¼Î±, aneurysma, dilation, from á¼Î½ÎµÏÏÏÎ½ÎµÎ¹Î½, aneurynein, to dilate) is a localized, blood-filled balloon-like bulge in the wall of a blood vessel.n aneurysm or aneurism (from Greek: á¼Î½ÎµÏÏÏÏÎ¼Î±, aneurysma, dilation, from á¼Î½ÎµÏÏÏÎ½ÎµÎ¹Î½, aneurynein, to dilate) is a localized, blood-filled balloon-like bulge in the wall of a blood vessel.
Medical Definition of ANEURYSM. : an abnormal blood-filled dilatation of a blood vessel and especially an artery resulting from disease of the vessel wall. â anÂ·euÂ·rysÂ·mal also anÂ·euÂ·risÂ·mal \Ëan-yÉ-Ëriz-mÉl\ adjective. â anÂ·euÂ·rysÂ·malÂ·ly \-Ä\ adverb.efinition of ANEURYSM. : an abnormal blood-filled bulge of a blood vessel and especially an artery resulting from weakening (as from disease) of the vessel wall. â anÂ·euÂ·rysÂ·mal \Ëan-yÉ-Ëriz-mÉl\ adjective. anÂ·euÂ·rysm also anÂ·euÂ·rism \Ëan-yÉ-Ëri-zÉm\.