Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fibrinous clot formed in a blood vessel or in a chamber of the heart.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A blood clot formed from platelets and other elements; that forms in a blood vessel in a living organism, and causes thrombosis or obstruction of the vessel at its point of formation or travel to other areas of the body.

from the GNU version of the Collaborative International Dictionary of English

  • n. A clot of blood formed of a passage of a vessel and remaining at the site of coagulation.
  • n. A tumor produced by the escape of blood into the subcutaneous cellular tissue.

from The Century Dictionary and Cyclopedia

  • n. In pathology: A small tumor which sometimes arises after bleeding, owing to escape of the blood from the vein into the cellular structure surrounding it, and its coagulation there.
  • n. A fibrinous coagulum or clot which forms in and obstructs a blood-vessel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

New Latin, from Greek thrombos, clot.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Modern Latin thrombus, from the Ancient Greek θρόμβος (thrombos, "lump”, “piece”, “blood clot”, “milk curd"); compare thrombo-. (Wiktionary)

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