Co*ag"u*late (?), a. [L. coagulatus, p. p. of coagulare to coagulate, fr. coagulum means of coagulation, fr. cogere, coactum, to drive together, coagulate. See Cogent.] Coagulated. [Obs.] Shak.

Co*ag"u*late (?), v. t. [imp. & p. p. Coagulated (?); p. pr. & vb. n. Coagulating (?).] To cause (a liquid) to change into a curdlike or semisolid state, not by evaporation but by some kind of chemical reaction; to curdle; as, rennet coagulates milk; heat coagulates the white of an egg.

Co*ag"u*late, v. i. To undergo coagulation. Boyle.

Syn. -- To thicken; concrete; curdle; clot; congeal.

• To cause to congeal, to convert from a liquid to a semisolid mass.
       In cheese making Rennet causes milk to coagulate into curds that become cheese.