- A white, albuminous, fibrous substance, formed in the coagulation of the blood.
- An elastic, insoluble, whitish protein produced by the action of thrombin on fibrinogen and forming an interlacing fibrous network in the coagulation of blood.
- An albuminous body, resembling animal fibrin in composition, found in cereal grains and similar seeds; vegetable fibrin.
- (medicine) factor Ia
- To apply fibrin sealant to a surgical site to either stop bleeding or for surgical flap closure.
- fibrin in The Century Dictionary, The Century Co., New York, 1911