Dictionary.net

Constituent composed of protein and phospholipid that is widely distributed in many tissues. It serves as a cofactor with factor VIIa to activate factor X in the extrinsic pathway of blood coagulation.

An antibody causing coagulation of the antigen.

Any substance capable of coagulating albuminous substances.

[Latin] Any agent capable of coagulating albuminous substances.

The name given by Loeb to hypothetical enzyme bodies contained in the tissues and capable of acting like fibrin ferment in converting fibrinogen into fibrin.