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a permanent cardiac or arterial dilatation usually caused by weakening of the vessel wall.
Historical Examples

The size of the aneurism varies between that of a pea and that of a mans head.
Parasites T. Spencer Cobbold

Physicians had been sent for, who had attributed his death to an aneurism.
The Son of Monte Christo Jules Lermina

Dempster died suddenly this morning of aneurism of the heart, leaving no confession of any kind.’
Sheilah McLeod Guy Boothby

The aneurism continued to contract, and the patient was sent home.
Surgical Experiences in South Africa, 1899-1900 George Henry Makins

The aneurism was of the third part of the axillary artery, and a ligature was applied at the lower margin of the pectoralis minor.
Surgical Experiences in South Africa, 1899-1900 George Henry Makins

It was too late; the aneurism had burst, and the colonel was dead.
Brazilian Tales Joaquim Maria Machado de Assis

From this operation the patient made a good recovery, and when discharged there was no sign of an aneurism of the vein.’
Surgical Experiences in South Africa, 1899-1900 George Henry Makins

But apoplexy may kill one in two hours, and aneurism only takes two minutes.
The Three Cities Trilogy, Complete Emile Zola

The wall of the aneurism is atheromatous, or calcified; the middle coat may be atrophied.
Special Report on Diseases of the Horse United States Department of Agriculture

Souris had just died suddenly from the rupture of an aneurism.
Original Short Stories, Volume 8 (of 13) Guy de Maupassant

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

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.”
n.

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”).

aneurysm an·eu·rysm or an·eu·rism (ān’yə-rĭz’əm)
n.
A localized, blood-filled dilation of a blood vessel caused by disease or weakening of the vessel wall.
an’eu·rys’mal (-məl) or an’eu·ris·mat’ic (-māt’ĭk) adj.
aneurysm
(ān’yə-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.