Definition of substructure noun from the Oxford Advanced Learner's Dictionary

 

substructure

 noun
noun
BrE BrE//ˈsʌbstrʌktʃə(r)//
 
; NAmE NAmE//ˈsʌbstrʌktʃər//
 
Structures
 
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a base or structure that is below another structure and that supports it a substructure of timber piles (figurative) the substructure of national culture compare superstructure See related entries: Structures
See the Oxford Advanced American Dictionary entry: substructure