- The change from a liquid to a thickened, curdlike,
insoluble state, not by evaporation, but by some kind of chemical
reaction; as, the spontaneous coagulation of freshly drawn blood; the
coagulation of milk by rennet, or acid, and the coagulation of egg
albumin by heat. Coagulation is generally the change of an albuminous
body into an insoluble modification. - The substance or body formed by coagulation.