understructure

Noun
  1. Lowest support of a structure (synset 103391862)
    "it was built on a base of solid rock"; "he stood at the foot of the tower"
    is a type of: support - supporting structure that holds up or provides a foundation
    subtypes:
    • bed - a foundation of earth or rock supporting a road or railroad track
    • mat, raft, raft foundation - a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete
    is a part of: construction, structure - a thing constructed; a complex entity constructed of many parts
    same as: base, foot, foundation, fundament, groundwork, substructure

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