Etymology
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heparin (n.)

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

updated on October 29, 2018

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Definitions of heparin from WordNet

heparin (n.)
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;
Synonyms: Lipo-Hepin / Liquaemin
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.