The Collaborative International Dictionary of English v.0.48:

Curdle \Cur"dle\, v. t. [imp. & p. p. Curdled (-d'ld); p. pr.
   & vb. n. Curdling (-dl[i^]ng).]
   1. To change into curd; to cause to coagulate. "To curdle
      whites of eggs" --Boyle.
      [1913 Webster]

   2. To congeal or thicken.
      [1913 Webster]

            My chill blood is curdled in my veins. --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

curdled
    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]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "curdled":
   adhesive, amylaceous, caked, cakey, clabbered, clammy, clotted,
   coagulated, congealed, curded, doughy, gaumy, gelatinized,
   gelatinous, glairy, gluelike, gluey, glutenous, glutinose,
   glutinous, gooey, grumous, gumbo, gumbolike, gumlike, gummous,
   gummy, heavy, incrassate, inspissate, inspissated, jelled, jellied,
   jellylike, lumpish, lumpy, mucilaginous, pasty, ropy, slabby,
   slimy, slithery, starchy, sticky, stodgy, stringy, syrupy, tacky,
   tenacious, thick, thickened, tough, tremelloid, tremellose, viscid,
   viscose, viscous