antithromboplastin

an·ti·throm·bo·plas·tin -.thräm-bə-'plas-tən n an anticoagulant substance that counteracts the effects of thromboplastin

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an·ti·throm·bo·plas·tin (an″te-) (an″ti-throm″bo-plasґtin) any agent or substance that prevents or interferes with the interaction of the blood coagulation factors as they generate prothrombinase.