Coagulation \Co*ag`u*la"tion\, n. [L. coagulatio.]

1. 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.

Source: Webster's Revised Unabridged Dictionary (1913)