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[an-yuh-riz-uh m] /ˈæn yəˌrɪz əm/
noun, Pathology
a permanent cardiac or arterial dilatation usually caused by weakening of the vessel wall.
Also, aneurism.
Origin of aneurysm
1650-60; < Greek aneúrysma dilation, equivalent to aneurys- (variant stem of aneurýnein to dilate; see an-3, eury-) + -ma noun suffix
Related forms
aneurysmal, aneurismal, adjective
aneurysmally, aneurismally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for aneurysm
  • When an aneurysm in a cerebral artery ruptures, the result is a hemorrhagic stroke.
  • All my dreams and desires all wrapped up in one awesome show almost gave me a aneurysm.
  • Though the region with the aneurysm is initially wider than normal, blood swirling in aneurysm can clot.
  • Cindy suffered a brain aneurysm while biking, an activity she loved.
  • Blood clots that form around this coil prevent the aneurysm from breaking open and bleeding.
  • The cause was an aneurysm in the aorta, his family said.
  • Doctors perform surgery to treat an abdominal aortic aneurysm.
  • He has since had a stroke and now has an inoperable aneurysm, diabetes and congestive heart failure.
  • Friends said the cause was heart failure during treatment for an aneurysm.
  • They are usually caused by the rupture of an aneurysm, a bulge in a blood vessel, which creates a weakening in the artery wall.
British Dictionary definitions for aneurysm


a sac formed by abnormal dilation of the weakened wall of a blood vessel
Derived Forms
aneurysmal, aneurismal, aneurysmatic, aneurismatic, adjective
aneurysmally, aneurismally, aneurysmatically, aneurismatically, adverb
Word Origin
C15: from Greek aneurusma, from aneurunein to dilate, from eurunein to widen
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for aneurysm

early 15c., from Medieval Latin aneurisma, from Greek aneurysmos "dilation," from aneurynein "to dilate," from ana- "up" (see ana-) + eurynein "widen," from eurys "broad, wide," from PIE root *were- "wide, broad" (cf. Sanskrit uruh "broad, wide").

Online Etymology Dictionary, © 2010 Douglas Harper
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aneurysm in Medicine

aneurysm an·eu·rysm or an·eu·rism (ān'yə-rĭz'əm)
A localized, blood-filled dilation of a blood vessel caused by disease or weakening of the vessel wall.

an'eu·rys'mal (-məl) or an'eu·ris·mat'ic (-māt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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aneurysm in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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