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Answer for the clue "An enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot ", 14 letters:
thromboplastin

Word definitions for thromboplastin in dictionaries

Wikipedia Word definitions in Wikipedia
Thromboplastin is a plasma protein aiding blood coagulation through catalyzing the conversion of prothrombin to thrombin. It is a complex enzyme that is found in brain, lung, and other tissues and especially in blood platelets and that functions in the ...

Wiktionary Word definitions in Wiktionary
n. (context enzyme English) A protease that converts prothrombin to thrombin during the clotting of blood

WordNet Word definitions in WordNet
n. an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot [syn: thrombokinase , factor III ]

Usage examples of thromboplastin.

Even assays for adrenal hormones and things like partial thromboplastin times.

In particular, we will be looking for damage to blood vessels, since this releases tissue thromboplastin, and stimulates clotting at the site of the damage.