noun, plural thrombi [throm-bahy] . Pathology.
a fibrinous clot that forms in and obstructs a blood vessel, or that forms in one of the chambers of the heart.

1685–95; < Neo-Latin < Greek thrómbos clot, lump Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thrombus (ˈθrɒmbəs)
n , pl -bi
Compare embolus 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
[C17: from New Latin, from Greek thrombos lump, of obscure origin]

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
thrombus   (thrŏm'bəs)  Pronunciation Key 
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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Example sentences
Click the icon to see an image depicting a thrombus.
The pulmonary arteries are normally developed, patent and without thrombus or embolus.
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