The Collaborative International Dictionary of English v.0.48:

Congeal \Con*geal"\, v. t. [imp. & p. p. Congealed; p. pr. &
   vb. n. Congealing.] [F. congeler, L. congelare, -gelatumn;
   con- + gelare to freeze, gelu frost. See Gelid.]
   1. To change from a fluid to a solid state by cold; to
      freeze.

   Syn: jell, set.
        [1913 Webster]

              A vapory deluge lies to snow congealed. --Thomson.
        [1913 Webster]

   2. To affect as if by freezing; to check the flow of, or
      cause to run cold; to chill.
      [1913 Webster]

            As if with horror to congeal his blood. --Stirling.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Congeal \Con*geal"\, v. i.
   To grow hard, stiff, or thick, from cold or other causes; to
   become solid; to freeze; to cease to flow; to run cold; to be
   chilled.

   Syn: jell, set.
        [1913 Webster]

              Lest zeal, now melted . . .
              Cool and congeal again to what it was. --Shak.
        [1913 Webster]

WordNet (r) 3.0 (2006):

congeal
    v 1: become gelatinous; "the liquid jelled after we added the
         enzyme" [syn: jell, set, congeal]