em·bo·lus 
(ĕmbə-ləs)
(ĕmbə-ləs)n. pl. em·bo·li (-lī′)
A mass, such as an air bubble, a detached blood clot, or a foreign body, that travels through the bloodstream and lodges so as to obstruct or occlude a blood vessel.
[Latin, piston of a pump, from Greek embolos, stopper, plug, from emballein, to insert; see EMBLEM.]
- opsonic
- opsonin
- opsonization
- opsonize
- -opsy
- opt
- opt.
- optative
- optatively
- optic
- optical
- optical activity
- optical amplifier
- optical art
- optical character reader
- optical character recognition
- optical computer
- optical disc
- optical disk
- optical fiber
- optical illusion
- optical isomer
- optically
- optically active
- optical maser