An older spelling of aneurysm, which is a dangerous bulge or weakened spot in an artery wall that can rupture and cause internal bleeding.
From Greek ana- (up) + eurynein (to widen), literally 'a widening.' The Latin medical spelling was aneurysma, and 'aneurism' is an earlier English variant.
Aneurysms are terrifyingly silent—they can grow inside you for years with no symptoms, which is why they're sometimes called 'time bombs'; once they start leaking or rupture, it's a medical emergency.
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