[ an] ′yo̵̅o̅ riz′əm, -yə-
The definition of an aneurysm is a blood-filled sac in the weakened wall of a blood vessel or the heart.
An abnormal outward bulging of one of the blood vessels in the brain is an example of an aneurysm.
aneurysm definition by Webster's New World
a sac formed by local enlargement of the weakened wall of an artery, a vein, or the heart, caused by disease or injury
Origin: Modern Latin aneurisma ; from Classical Greek aneurysma ; from ana-, up plush eurys, broad: see eury- Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc. aneurysm definition by American Heritage Dictionary
A localized, pathological, blood-filled dilatation of a blood vessel caused by a disease or weakening of the vessel's wall.
Origin: Middle English aneurisme, ultimately from Greek aneurusma, from aneurein, to dilate : ana-, throughout; see ana- + eurus, wide. Related Forms: The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. aneurysm - Medical Definition
A localized, blood-filled dilation of a blood vessel caused by disease or weakening of the vessel wall.
Related Forms: aneurysm
abdominal aortic aneurysm
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. aneurysm - Science Definition
A localized, blood-filled dilation of a blood vessel or cardiac chamber caused by disease, such as arteriosclerosis, or weakening of the vessel or chamber wall. A ruptured aneurysm results in hemorrhage and is often fatal.