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un•der•struc•ture(ˈʌn dərˌstrʌk tʃər)
a structure serving as a support; base or foundation.
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|Noun||1.||understructure - lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"|
bed - a foundation of earth or rock supporting a road or railroad track; "the track bed had washed away"
raft foundation - a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete
structure, construction - a thing constructed; a complex entity constructed of many parts; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"
support - supporting structure that holds up or provides a foundation; "the statue stood on a marble support"