• synonyms


or an·eu·rism

[an-yuh-riz-uh m]
noun Pathology.
  1. a permanent cardiac or arterial dilatation usually caused by weakening of the vessel wall.
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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 formsan·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. 2018

Examples from the Web for aneurism

Historical Examples

  • But apoplexy may kill one in two hours, and aneurism only takes two minutes.

    The Three Cities Trilogy, Complete

    Emile Zola

  • But she is evidently in bad health, and dies the same night of aneurism.

  • Physicians had been sent for, who had attributed his death to an aneurism.

  • The aneurism continued to contract, and the patient was sent home.

  • He also had an operation, like that of Antyllus, for the cure of aneurism.

British Dictionary definitions for aneurism



  1. a sac formed by abnormal dilation of the weakened wall of a blood vessel
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Derived Formsaneurysmal, aneurismal, aneurysmatic or aneurismatic, adjectiveaneurysmally, aneurismally, aneurysmatically or 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

Word Origin and History for aneurism


the less correct, but more popular, spelling of aneurysm (q.v.), by influence of words in -ism. The -y- is etymologically correct; the spelling with -i- suggests a meaning "nervelessness."

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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").

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Online Etymology Dictionary, © 2010 Douglas Harper

aneurism in Medicine


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

aneurism in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.