[throm-buh s]
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noun, plural throm·bi [throm-bahy] /ˈθrɒm baɪ/. Pathology.
  1. a fibrinous clot that forms in and obstructs a blood vessel, or that forms in one of the chambers of the heart.

Origin of thrombus

1685–95; < New Latin < Greek thrómbos clot, lump Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of thrombus

British Dictionary definitions for thrombus


noun plural -bi (-baɪ)
  1. a clot of coagulated blood that forms within a blood vessel or inside the heart and remains at the site of its formation, often impeding the flow of bloodCompare embolus

Word Origin for thrombus

C17: from New Latin, from Greek thrombos lump, of obscure origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for thrombus

1690s, Modern Latin, from Greek thrombos "lump, piece, clot of blood, curd of milk."

Online Etymology Dictionary, © 2010 Douglas Harper

thrombus in Medicine


n. pl. throm•bi (-bī)
  1. A fibrinous clot formed in a blood vessel or in a chamber of the heart.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

thrombus in Science


Plural thrombi (thrŏmbī′)
  1. A clot consisting of fibrin, platelets, red blood cells, and white blood cells that forms in a blood vessel or in a chamber of the heart and can obstruct blood flow. The rupture of atherosclerotic plaques can cause arterial thrombosis (the formation of thrombi), while tissue injury, decreased movement, oral contraceptives, prosthetic heart valves, and various metabolic disorders increase the risk for venous thrombosis. A thrombus in a coronary artery can cause a heart attack. Compare embolus.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.