The Etymology of Aneurysm
Aneurysm is a Hippocratic word — it appears in Greek medical texts of the 5th century BC, where physicians had already noticed that artery walls sometimes balloon outward into dangerous, throbbing swellings. The components are transparent: ana- (up, throughout) plus eurys (wide), giving aneurysma, a widening. English absorbed it in the late 14th century via Latin aneurisma, when European medicine was rediscovering the Greek and Arabic surgical traditions. The same root eurys hides in some surprising places: Europe (probably from Greek Europe, possibly meaning wide-faced, an epithet of the moon goddess); eurythmics (good rhythm, but also wide, free movement); and the rarer eurytopic (tolerating a wide range of conditions, used of organisms). Modern medicine distinguishes saccular, fusiform, and dissecting aneurysms — but all of them, etymologically, are simply wide places where a blood vessel ought to be narrow.