A preternatural dilatation or rupture of the coats of an artery. This is encysted or diffused. The encysted aneurism is when the coats of the artery being only dilated, the blood is confined to its proper coat. Of this kind is the varicose. The diffused aneurism includes all those in which, from an aperture in the artery, the blood is spread about in the cellular membrane, out of its proper course.
Word of the Day: Catachrestical
A soft, pulsating, hollow tumor, containing blood, arising from the preternatural dilation or rupture of the coats of an artery.
Aneurism
Encyclopedia Britannica
ANEURISM (from άνευρυσγζα, a dilatation), a cavity, which contains blood, either fluid or coagulated, and which communicates with an artery; the walls of the cavity are formed either of the dilated artery or of the tissues around the vessel. This affection, a malady of middle life and old age, may arise in consequence of injury or disease of the blood-vessels.
9th ed. Encyclopædia Britannica, vol. 2, p. 26
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Pertaining to an aneurism.
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