Try Our Apps


Avoid these words. Seriously.


[hep-uh-rin] /ˈhɛp ə rɪn/
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.
Origin of heparin
1915-20; < Greek hêpar the liver + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
British Dictionary definitions for heparin


a polysaccharide, containing sulphate groups, present in most body tissues: an anticoagulant used in the treatment of thrombosis
Derived Forms
heparinoid, adjective
Word Origin
C20: from Greek hēpar the liver + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for heparin

substance found in the liver, lungs and other tissues, 1918, from Greek hepar "liver" (see hepatitis) + -in (2).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
heparin in Medicine

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.
Cite This Source
heparin in Science
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.
Cite This Source

Word of the Day

Nearby words for heparin

Difficulty index for heparin

Many English speakers likely know this word

Word Value for heparin

Scrabble Words With Friends