Biochemistry. a polysaccharide, occurring in various tissues, especially the liver, and having anticoagulent properties.
Pharmacology. a commercial form of this substance, obtained from the liver and lungs of domesticated food animals, that when injected into the blood prevents coagulation: used chiefly in the treatment of thrombosis.

1915–20; < Greek hêpar the liver + -in2

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World English Dictionary
heparin (ˈhɛpərɪn)
a polysaccharide, containing sulphate groups, present in most body tissues: an anticoagulant used in the treatment of thrombosis
[C20: from Greek hēpar the liver + -in]

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American Heritage
Medical Dictionary

heparin hep·a·rin (hěp'ər-ĭn)
A complex organic acid that is found especially in lung and liver tissue, has a mucopolysaccharide as its active constituent, prevents platelet agglutination and blood clotting, and is used in the form of its sodium salt in the treatment of thrombosis.

hep'a·rin'i·za'tion (-ə-rĭn'ĭ-zā'shən) n.
hep'a·rin·ize' (-ər-ə-nīz') v.
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
heparin   (hěp'ər-ĭn)  Pronunciation Key 
An acidic glycosaminoglycan found especially in lung and liver tissue that prevents the clotting of blood and is used intravenously in the treatment of thrombosis and embolism.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The test may also be used to monitor patients who are taking heparin, a blood thinner.
But heparin, a frequently prescribed anticoagulant drug, is made from the lungs and bovine mucosa.
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