a sac like widening of a blood vessel
- a cardiovascular disease characterized by a saclike widening of an artery caused by weakening regarding the artery wall
A localized widening (dilatation) of an artery, a vein, or the heart. At point of an aneurysm, there is usually a bulge. The wall of the blood-vessel or organ is weakened and may rupture.
very early 15c., from Medieval Latin aneurisma, from Greek aneurysmos "dilation," from aneurynein "to dilate," from ana- "up" (see ana-) + eurynein "widen," from eurys "broad, broad" (see eury-).
The development of an artery; frequently formed like a bubble or balloon.