1. The basic structure or features of a system or organization
   "The company's financial substructure needed reform";
   - infrastructure
    
2. Lowest support of a structure
   "it was built on a substructure of solid rock";
   - foundation, base, fundament, foot, groundwork, understructure
    
3. [technical] Fundamental or smaller structures within a larger system or structure
   "The galaxy cluster's substructure revealed dark matter distribution"

Derived forms: substructures

Type of: build, structure, support

Part of: construction, structure, system

Encyclopedia: Substructure