Noun | 1. | heparin - a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery anticoagulant medication, decoagulant - medicine that prevents or retards the clotting of blood polyose, polysaccharide - any of a class of carbohydrates whose molecules contain chains of monosaccharide molecules |