- antiprothrombin
- An anticoagulant that inhibits or prevents the conversion of prothrombin into thrombin; examples are heparin, which is present in various tissues (especially in liver), and dicoumarin, which is isolated from partially decomposed sweet clover.
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an·ti·pro·throm·bin -(.)prō-'thräm-bən n a substance that interferes with the conversion of prothrombin to thrombin compare ANTITHROMBIN, HEPARIN* * *
an·ti·pro·throm·bin (an″te-) (an″ti-pro-thromґbin) 1. directed against prothrombin. 2. any of a diverse group of anticoagulants that retard the conversion of prothrombin to thrombin by any means.
Medical dictionary. 2011.