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substructure (n.)

1726, "foundation, part of a building which supports another part," from sub- + structure (n.). Earlier in this sense was substruction (1620s). Related: Substructural.

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Definitions of substructure from WordNet

substructure (n.)
the basic structure or features of a system or organization;
Synonyms: infrastructure
substructure (n.)
lowest support of a structure;
Synonyms: foundation / base / fundament / foot / groundwork / understructure
From wordnet.princeton.edu