em·bo·lus /ˈɛmbələs/
  栓子,栓塞物
  em·bo·lus /ˈɛmbələs/ 名詞
  栓子
  Em·bo·lus n.; pl. Emboli
  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.
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  embolus
       n : an abnormal particle (e.g. an air bubble or part of a clot)
           circulating in the blood
       [also: emboli (pl)]