or an·eu·rism

[ an-yuh-riz-uh m ]
/ ˈæn yəˌrɪz əm /

noun Pathology.

a permanent cardiac or arterial dilatation usually caused by weakening of the vessel wall.

Origin of aneurysm

1650–60; < Greek aneúrysma dilation, equivalent to aneurys- (variant stem of aneurýnein to dilate; see an-3, eury-) + -ma noun suffix


an·eu·rys·mal, an·eu·ris·mal, adjectivean·eu·rys·mal·ly, an·eu·ris·mal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for aneurism

British Dictionary definitions for aneurism



/ (ˈænjəˌrɪzəm) /


a sac formed by abnormal dilation of the weakened wall of a blood vessel

Derived forms of aneurysm

aneurysmal, aneurismal, aneurysmatic or aneurismatic, adjectiveaneurysmally, aneurismally, aneurysmatically or aneurismatically, adverb

Word Origin for aneurysm

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

Medical definitions for aneurism



A localized, blood-filled dilation of a blood vessel caused by disease or weakening of the vessel wall.

Other words from aneurysm

an′eu•rysmal (-məl) null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for aneurism

[ ănyə-rĭz′əm ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.