Substructure definition

Substructure

Topics Substructure Definition

WordNet

(1) Lowest support of a structure

"It was built on a base of solid rock"

"He stood at the foot of the tower"

(2) The basic structure or features of a system or organization

WiktionaryText

The supporting part of a structure (either physical or organizational; the foundation).
The earth or gravel that railway sleepers are embedded in.