[1] : The Collaborative International Dictionary of English v.0.48

structural \struc"tural\, a.
   1. of or pertaining to structure; affecting structure; as, a
      structural error.
      1913 webster

   2. biol. of or pertaining to organit structure; as, a
      structural element or cell; the structural peculiarities
      of an animal or a plant.
      1913 webster

[2] : WordNet (r) 2.0

structural
     adj 1: relating to or caused by structure, especially political or
            economic structure; "structural unemployment in a
            technological society"
     2: relating to or having or characterized by structure;
        "structural engineer"; "structural errors"; "structural
        simplicity"
     3: affecting or involved in structure or construction; "the
        structural details of a house such as beams and joists and
        rafters; not ornamental elements"; "structural damage"
     4: concerned with systematic structure in a particular field of
        study
     5: pertaining to geological structure; "geomorphological
        features of the black hills"; "morphological features of
        granite"; "structural effects of folding and faulting of
        the earth's surface" syn: geomorphologic, geomorphological,
         morphologic, morphological
     6: relating to or concerned with the morphology of plants and
        animals; "morphological differences" syn: morphologic,
        morphological
see also:
geomorphologic geomorphological morphologic morphological 

[3] : Moby Thesaurus II by Grady Ward, 1.0

52 moby thesaurus words for "structural":
   adjectival, adverbial, anatomic, architectonic, architectural,
   attributive, building, conjunctive, constructional, copulative,
   correct, descriptive, edificial, formal, functional, glossematic,
   glottochronological, grammatic, graphemic, housing, intransitive,
   lexicographic, lexicological, lexicostatistical, lingual,
   linguistic, linking, metalinguistic, morphological, morphophonemic,
   nominal, organic, organismal, participial, philological, phonemic,
   phonetic, phonological, postpositional, prepositional, pronominal,
   psycholinguistic, semantic, substantive, substructural,
   superstructural, syntactic, tagmemic, tectonic, textural,
   transitive, verbal

Structural >> S Words
Structural, definition of term: Structural
structural_pag1.html

Structural Form >> S Words
Structural Form, definition of term: Structural Form
structural+form_pag1.html