n. [ Fibrin + -gen. ] (Physiol. Chem.) An albuminous substance existing in the blood, and in other animal fluids, which either alone or with fibrinoplastin or paraglobulin forms fibrin, and thus causes coagulation. [ 1913 Webster ]
a. (Physiol. Chem.) Possessed of properties similar to fibrinogen; capable of forming fibrin. [ 1913 Webster ]