- A white, albuminous, fibrous substance, formed in the
coagulation of the blood either by decomposition of fibrinogen, or from
the union of fibrinogen and paraglobulin which exist separately in the
blood. It is insoluble in water, but is readily digestible in gastric
and pancreatic juice. - The white, albuminous mass remaining after washing lean
beef or other meat with water until all coloring matter is removed; the
fibrous portion of the muscle tissue; flesh fibrin. - An albuminous body, resembling animal fibrin in
composition, found in cereal grains and similar seeds; vegetable
fibrin.