Pronunciation: (hep'u-rin),[key] —n. 1. Biochem.a polysaccharide, occurring in various tissues, esp. the liver, and having anticoagulent properties.
2. Pharm.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.