Breadcrumb Home > Dictionary > Index A aneurysm: Meaning and Definition of Find definitions for: an•eu•rysm Pronunciation: (an'yu-riz"um), [key] — n. Pathol. a permanent cardiac or arterial dilatation usually caused by weakening of the vessel wall. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aneurysm (Thesaurus) aneurin anew ✖ Related Content Daily Word Quiz: donnybrook Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language