1. substructure - noun
· the basic structure or features of a system or organization
Synonym(s): infrastructure
Hypernym(s): structure
2. substructure - noun
· lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"
Synonym(s): foundation, base, fundament, foot, groundwork, understructure
Hypernym(s): support
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