Substructure
/ˈsʌbˈstrʌktʃər/
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Definition
(noun) The supporting part of a structure (either physical or organizational; the foundation).
Sentence Examples
The engineer checked the substructure of the large bridge.
A substructure is an underlying or a supporting structure.
CEFR Practice Quiz
The engineers inspected the ____ of the bridge to check for any signs of rust or damage from the river.