an·ti·co·ag·u·lant

[an-tee-koh-ag-yuh-luhnt, an-tahy-] Biochemistry, Pharmacology.
adjective
1.
Also, an·ti·co·ag·u·la·tive preventing coagulation, especially of blood.
noun
2.
an anticoagulant agent, as heparin.

Origin:
1900–05; anti- + coagulant

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
anticoagulant (ˌæntɪkəʊˈæɡjʊlənt) [Click for IPA pronunciation guide]
 
adj
1.  acting to prevent or impair coagulation, esp of blood
 
n
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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00:10
Anticoagulant has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Etymonline
Word Origin & History

anticoagulant
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-)
n.
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
What's causing this ripple is the emergence of new anticoagulant drugs, or
  blood thinners.
But heparin, a frequently prescribed anticoagulant drug, is made from the lungs
  and bovine mucosa.
If necessary, an anticoagulant drug such as heparin may be given, but this
  increases the risk of hemorrhage.
Patients have to supplement the device by taking anticoagulant medications that
  prevent blood clots.
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