ˌ ̷ ̷ ̷ ̷ˈplastə̇n noun
( -s )
Etymology: International Scientific Vocabulary thromboplast ic + -in
: a complex substance that contains chiefly protein and various phosphatides, that is found in brain, lung, and other tissues and especially in blood platelets, and that when released from disintegrating cells participates in the clotting of blood by promoting the conversion of prothrombin to thrombin ; also : a tissue extract rich in this substance sometimes used as a local hemostatic