thromboplastin

(-plastin)

noun

a substance released from blood platelets and injured body tissues that assists in the clotting of the blood by initiating the conversion of prothrombin to thrombin

Origin: thrombo- + -plast + -in

See thromboplastin in American Heritage Dictionary 4

noun
A protease that converts prothrombin to thrombin in the early stages of blood clotting. Also called thrombokinase.

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