Source : Webster's Revised Unabridged Dictionary (1913)

Structured \Struc"tured\, a. (Biol.)
   Having a definite organic structure; showing differentiation
   of parts.

         The passage from a structureless state to a structured
         state is itself a vital process.         --H. Spencer.

Source : WordNet®

structured
     adj 1: having definite and highly organized structure; "a
            structured environment" [ant: {unstructured}]
     2: resembling a living organism in organization or development;
        "society as an integrated whole" [syn: {integrated}]