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]