Webster's English Dictionary

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structural

struc.tur.al \'str*k-ch*-r*l, 'str*k-shr*l\ \-e-\ aj 1a: of, relating to, 
   or affecting structure {~ stability}  1b: used in building structures {~ 
   clay}  1c: involved in or caused by structure esp. of the economy {~ unem 
   ployment} 2: of or relating to the physical makeup of a plant or animal 
   body  3: of, relating to, or resulting from the effects of folding or 
   faulting o f the earth's crust : TECTONIC 4: concerned with or relating to 
   structure rather than history or comparis on {~ linguistics} - 
   struc.tur.al.ly av