aneurysm

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

Related forms

an·eu·rys·mal, an·eu·ris·mal, adjectivean·eu·rys·mal·ly, an·eu·ris·mal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for aneurysm

British Dictionary definitions for aneurysm

aneurysm

aneurism

/ (ˈænjəˌrɪzəm) /

noun

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

Derived Forms

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

Medicine definitions for aneurysm

aneurysm

n.

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

Related forms

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.

Science definitions for aneurysm

aneurysm

[ 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.