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Noun: substructure  súb'strúk-chu(r)
  1. The basic structure or features of a system or organization
    - infrastructure
     
  2. Lowest support of a structure
    "it was built on a substructure of solid rock";
    - foundation, base, fundament, foot, groundwork, understructure

Derived forms: substructures

Type of: structure, support

Part of: construction, structure, system

Encyclopedia: Substructure