Main Entry:

an·eu·rysm

Variant(s):

also an·eu·rism \ˈan-yə-ˌri-zəm\

Function:

noun

Etymology:

Greek aneurysma, from aneurynein to dilate, from ana- + eurynein to stretch, from eurys wide — more at eury-

Date:

15th century

: an abnormal blood-filled bulge of a blood vessel and especially an artery resulting from weakening (as from disease) of the vessel wall

— an·eu·rys·mal \ˌan-yə-ˈriz-məl\ adjective