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[throm-buh s] /ˈθrɒm bəs/
noun, plural thrombi
[throm-bahy] /ˈθrɒm baɪ/ (Show IPA).
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 Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for thrombi


noun (pl) -bi (-baɪ)
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 blood Compare embolus
Word Origin
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
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Word Origin and History for thrombi



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

Online Etymology Dictionary, © 2010 Douglas Harper
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thrombi in Medicine

thrombus throm·bus (thrŏm'bəs)
n. pl. throm·bi (-bī)
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.
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thrombi in Science
Plural thrombi (thrŏm'bī')
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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