1. understructure - noun
ยท lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"
Synonym(s): foundation, base, fundament, foot, groundwork, substructure
Hypernym(s): support
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ยท lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"
Synonym(s): foundation, base, fundament, foot, groundwork, substructure
Hypernym(s): support