Substructure Definition
 sŭbstrŭkchər 
  substructures
  
    noun
  
 
    substructures
  
A part or structure acting as a support, base, or foundation.
 Webster's New World 
The earth bank or bed supporting railroad tracks.
 American Heritage 
Other Word Forms of Substructure
Noun
Singular:
 substructurePlural:
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