from
The Collaborative International Dictionary of English v.0.48
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.
[1913 Webster]
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.
[1913 Webster]