Wordnet 3.0
ADJECTIVE (2)
1. 
 having definite and highly organized structure; 
- Example: "a structured environment"2. 
 resembling a living organism in organization or development; 
- Example: "society as an integrated whole"[syn: integrated, structured]
The Collaborative International Dictionary of English v.0.48:
Structured \Struc"tured\, a. (Biol.)
   Having a definite organic structure; showing differentiation
   of parts.
   [1913 Webster]
         The passage from a structureless state to a structured
         state is itself a vital process.         --H. Spencer.
   [1913 Webster]
WordNet (r) 3.0 (2006):
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,
       structured]