noun Biochemistry.
a plasma protein involved in blood coagulation that on activation by factors in the plasma is converted to thrombin.
Also called thrombogen.

1895–1900; pro-1 + thrombin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prothrombin (prəʊˈθrɒmbɪn)
biochem See also phylloquinone a zymogen found in blood that gives rise to thrombin on activation

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American Heritage
Medical Dictionary

prothrombin pro·throm·bin (prō-thrŏm'bĭn)
A glycoprotein formed by and stored in the liver and present in the blood plasma that is converted to thrombin in the presence of thromboplastin and calcium ion during blood clotting. Also called factor II.

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
prothrombin   (prō-thrŏm'bĭn)  Pronunciation Key 
A glycoprotein that is converted to thrombin during blood clotting. Prothrombin is formed by and stored in the liver.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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