| cothromboplastin | (noun) a coagulation factor formed in the kidney under the influence of vitamin K | Synonyms: factor VII, proconvertin, stable factor |
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| elastin | (noun) a fibrous scleroprotein found in elastic tissues such as the walls of arteries | - |
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| progestin | (noun) any of a group of steroid hormones that have the effect of progesterone | Synonyms: progestogen |
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| thromboplastin | (noun) an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot | Synonyms: factor III, thrombokinase |
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