(Science: anatomy, surgery) a sac formed by the dilatation of the wall of an artery, a vein or the heart.
The physical signs of arterial aneurysm are the formation of a pulsating tumour and often a bruit (aneurysmal bruit) heard over the swelling. Sometimes there are symptoms from pressure on contiguous parts.
Origin: gr. Aneurysma = a widening
a cardiovascular disease characterized by a sac-like widening of an artery resulting from weakening of the artery wall.