thrombi
  血栓
  Throm·bus n.; pl. Thrombi   Med. (a) A clot of blood formed of a passage of a vessel and remaining at the site of coagulation. (b) A tumor produced by the escape of blood into the subcutaneous cellular tissue.
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  thrombus
       n : a blood clot formed within a blood vessel and remaining
           attached to its place of origin
       [also: thrombi (pl)]