- The definition of an aneurysm is a blood-filled sac in the weakened wall of a blood vessel or the heart.
An abnormal outward bulging of one of the blood vessels in the brain is an example of an aneurysm.
Origin of aneurysmModern Latin aneurisma ; from Classical Greek aneurysma ; from ana-, up + eurys, broad: see eury-
Origin of aneurysmMiddle English aneurisme, ultimately from Greek aneurusma, from aneurein, to dilate : ana-, throughout; see ana– + eurus, wide.
left: normal abdominal aorta
right: abdominal aortic aneurysm
From Ancient Greek ἀνεύρυσμα (aneurysma, “a widening, an opening”), from ἀνά (ana, “up”) + εὐρύς (eurys, “wide”).