the.com/embolism

means A blockage in a blood vessel caused by something — a clot, air bubble, or fat globule — that traveled there from somewhere else in the body.

from From Greek 'embolos,' meaning a plug, wedge, or stopper, from 'emballein' (to throw in or insert) — the same root that gives us 'emblem.' Ancient surgeons used 'embolos' for things rammed or inserted into a space, like a bolt or a ship's battering ram. Medicine borrowed the word for exactly that image: a foreign plug, rammed into a vessel too narrow to let it pass.