thromboplastin
noun
throm·bo·plas·tin ˌthräm-bō-ˈpla-stən 
: a complex enzyme found especially in platelets that functions in the conversion of prothrombin into thrombin in the clotting of blood
Word History
Etymology
International Scientific Vocabulary, from thromboplastic
First Known Use
1911, in the meaning defined above
Medical Definition
thromboplastin
noun
throm·bo·plas·tin ˌthräm-bō-ˈplas-tən
: a complex enzyme that is found in brain, lung, and other tissues and especially in blood platelets and that functions in the conversion of prothrombin to thrombin in the clotting of blood
called also thrombokinase