Source : Webster's Revised Unabridged Dictionary (1913)

Structural \Struc"tur*al\, a.
   1. Of or pertaining to structure; affecting structure; as, a
      structural error.

   2. (Biol.) Of or pertaining to organit structure; as, a
      structural element or cell; the structural peculiarities
      of an animal or a plant.

   {Structural formula}. (Chem.) See {Rational formula}, under
      {Formula}.

Source : WordNet®

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}]