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Definition of: thromboplastin
(throm′bō·plas′tin) noun Biochem.
A complex substance present in the blood and other animal tissues, which reacts with calcium ions to give prothrombin. Also throm′bo·kin′ase (-kin′ās, -kī′nās). [<Gk. thrombos clot + -PLAST + -IN]
—throm′bo·plas′tic adjective
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