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Definition of: aneurysm
(an′yə·riz′əm) noun
A blood-filled, pulsating sac due to a localized abnormal dilatation of the wall of an artery. Also spelled an′eu·rism. [<Gk. aneurysma <ana- up + eurys wide]
—an·eu·rys·mal (an′yə·riz′məl) or ·ris′mal adjective
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