The Collaborative International Dictionary of English v.0.48:

Solidify \So*lid"i*fy\, v. t. [imp. & p. p. Solidified; p. pr.
   & vb. n. Solidifying.] [Solid + -fy: cf. F. solidifier.]
   To make solid or compact.
   [1913 Webster]

         Every machine is a solidified mechanical theorem. --H.
                                                  Spencer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

solidified
    adj 1: changed into a solid mass [syn: coagulated,
           solidified]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "solidified":
   backed, calcified, callous, calloused, case-hardened, clamped,
   compressed, concentrated, condensed, consolidated, constricted,
   contracted, cramped, crusted, crusty, crystallized, fossilized,
   granulated, hardened, hornified, incrusted, indurate, indurated,
   knitted, lapidified, nipped, ossified, petrified, pinched,
   pinched-in, puckered, pursed, reinforced, rigidified, sclerotic,
   set, squeezed, steeled, stiffened, strangled, strangulated,
   strengthened, toughened, vitrified, wasp-waisted, wrinkled