embolus

/ˈɛmbələs/
noun
  1. A blood clot, air bubble, or other particle that travels through the bloodstream and can block a blood vessel.
    • A blood clot that breaks loose and travels to the lungs is called a pulmonary embolus.
    • If an embolus lodges in a narrow vessel, it can cause a stroke or heart attack.
    • The doctor identified an embolus in the artery supplying blood to the patient's brain.
Synonyms
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