Source : Webster's Revised Unabridged Dictionary (1913)

Aneurism \An"eu*rism\, n. [Gr. ?, ?, a widening, an opening; ?
   up + ? wide.] (Med.)
   A soft, pulsating, hollow tumor, containing blood, arising
   from the preternatural dilation or rupture of the coats of an
   artery. [Written also {aneurysm}.]

Source : WordNet®

aneurism
     n : a cardiovascular disease characterized by a sac-like
         widening of an artery resulting from weakening of the
         artery wall [syn: {aneurysm}]