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]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "coagulate":
   Devonshire cream, adhere, agglomerate, beat up, blood clot,
   bonnyclabber, bunch, cake, casein, churn, clabber, clasp, cleave,
   clinch, cling, cling to, clot, clotted cream, clump, cluster,
   coagulum, coalesce, cohere, colloid, colloidize, compact,
   concentrate, concrete, condense, congeal, conglomerate,
   consolidate, crassamentum, cream, curd, curdle, dehydrate, dry,
   embolus, embrace, emulsify, emulsionize, freeze, freeze to, gel,
   gelatinate, gelatinize, grasp, grow together, grume, hang on,
   hang together, harden, hold, hold on, hold together, hug,
   incrassate, inspissate, jell, jellify, jelly, knot, legumin,
   lopper, loppered milk, lump, mass, paracasein, persist, set,
   solidify, stay, stay put, stick, stick together, take hold of,
   thick, thicken, thrombus, whip