The definition of an aneurysm is a blood-filled sac in the weakened wall of a blood vessel or the heart.(noun)
An abnormal outward bulging of one of the blood vessels in the brain is an example of an aneurysm.
See aneurysm in Webster's New World College Dictionary
Origin: ModL aneurisma < Gr aneurysma < ana-, up + eurys, broad: see eury-
See aneurysm in American Heritage Dictionary 4
Origin: Middle English aneurisme
Origin: , ultimately from Greek aneurusma
Origin: , from aneurein, to dilate
Origin: : ana-, throughout; see ana-
Origin: + eurus, wide.
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