Hypertext Webster Gateway: "embolus"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Embolus \Em"bo*lus\, n.; pl. {Emboli}. [L., fr. Gr. ? pointed so
as to be put or thrust in, fr. ? to throw, thrust, or put in.
See {Emblem}.]
1. Something inserted, as a wedge; the piston or sucker of a
pump or syringe.
2. (Med.) A plug of some substance lodged in a blood vessel,
being brought thither by the blood current. It consists
most frequently of a clot of fibrin, a detached shred of a
morbid growth, a globule of fat, or a microscopic
organism.
From WordNet (r) 1.7 (wn)
embolus
n : an abnormal particle (e.g. an air bubble or part of a clot)
circulating in the blood
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