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• n  a blood clot formed within a blood vessel and remaining attached to its place of origin

• A thrombus stays in one place; an embolus, which might be a blood clot, or a pocket of air or oil, moves through the blood stream.
• In the past ten years, he said, it has been shown that formation of a thrombus that will plug an artery is a complex process following an inflammatory reaction and involving an .
• But the thrombus grows, may eventually let loose daughter clots (emboli) which swim on to lodge at vital bottlenecks in the blood stream.