Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A localized, pathological, blood-filled dilatation of a blood vessel caused by a disease or weakening of the vessel's wall.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An abnormal blood-filled swelling of an artery or vein, resulting from a localized weakness in the wall of the vessel.

from the GNU version of the Collaborative International Dictionary of English

  • n. a sac-like widening of a blood vessel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a cardiovascular disease characterized by a saclike widening of an artery resulting from weakening of the artery wall

Etymologies

Middle English aneurisme, ultimately from Greek aneurusma, from aneurein, to dilate : ana-, throughout; see ana- + eurus, wide.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἀνεύρυσμα (aneurysma, "a widening, an opening"), from ἀνά (ana, "up") + εὐρύς (eurys, "wide"). (Wiktionary)

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