Definition of substructure noun from the Oxford Advanced American Dictionary

     

    substructure

     noun
    noun
    NAmE//ˈsʌbˌstrʌktʃər//
     
     
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  1. 1a base or structure that is below another structure and that supports it a substructure of timber piles
  2. 2(figurative) the substructure of national culture compare superstructure
See the Oxford Advanced Learner's Dictionary entry: substructure