substructures
/S AH1 B S T R AH0 K CH ER0 Z/noun
- 1
The supporting part of a structure (either physical or organizational; the foundation).
- 2
The earth or gravel that the railway tracks are embedded in.
Synonyms
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Source: https://en.wiktionary.org/wiki/substructure, https://en.wiktionary.org/wiki/substructures