understructure

Synonyms:

base, foot, foundation, fundament, groundwork, substructure

Types:

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bed

a foundation of earth or rock supporting a road or railroad track

raft foundation

a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete

railroad bed

a bed on which railroad track is laid

roadbed

a bed supporting a road

Type of:

support

supporting structure that holds up or provides a foundation