[an-tee-koh-ag-yuh-luhnt, an-tahy-] Biochemistry, Pharmacology.
Also, anticoagulative [an-tee-koh-ag-yuh-ley-tiv, -luh-tiv, an-tahy-] . preventing coagulation, especially of blood.
an anticoagulant agent, as heparin.

1900–05; anti- + coagulant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anticoagulant (ˌæntɪkəʊˈæɡjʊlənt)
1.  acting to prevent or impair coagulation, esp of blood
2.  an agent that prevents or impairs coagulation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1905, from anti- + coagulant (see coagulate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anticoagulant an·ti·co·ag·u·lant (ān'tē-kō-āg'yə-lənt, ān'tī-)
A substance that delays or prevents the clotting of blood. adj.
Acting as an anticoagulant.

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
anticoagulant   (ān'tē-kō-āg'yə-lənt, ān'tī-)  Pronunciation Key 
A substance that prevents the clotting of blood.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But the researchers showed that their heparin is nontoxic and works well as an anticoagulant in animals.
The anticoagulant can sometimes cause spontaneous bleeding.
The anticoagulant warfarin, for example, is frequently prescribed to prevent
  blood clots.
But heparin, a frequently prescribed anticoagulant drug, is made from the lungs
  and bovine mucosa.
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