how are fibrus proteins formed
Medical Definition of FIBRIN. : a white insoluble fibrous protein formed from fibrinogen by the action of thrombin especially in the clotting of blood.â fiÂ·briÂ·nous \-brÉ-nÉs\ adjective.See fibrin defined for kids. a white insoluble fibrous protein formed from fibrinogen by the action of thrombin especially in the clotting of blood. â fiÂ·briÂ·nous \-brÉ-nÉs\ adjective.