The Collaborative International Dictionary of English v.0.48:

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

   Syn: To thicken; concrete; curdle; clot; congeal.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coagulate \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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coagulate \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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

coagulate
    adj 1: transformed from a liquid into a soft semisolid or solid
           mass; "coagulated blood"; "curdled milk"; "grumous blood"
           [syn: coagulate, coagulated, curdled, grumous,
           grumose]
    v 1: change from a liquid to a thickened or solid state;
         "coagulated blood" [syn: clot, coagulate]
    2: cause to change from a liquid to a solid or thickened state
       [syn: clot, coagulate]