Search Result for "understructure": 
Wordnet 3.0

NOUN (1)

1. lowest support of a structure;
- Example: "it was built on a base of solid rock"
- Example: "he stood at the foot of the tower"
[syn: foundation, base, fundament, foot, groundwork, substructure, understructure]



WordNet (r) 3.0 (2006):

understructure
    n 1: lowest support of a structure; "it was built on a base of
         solid rock"; "he stood at the foot of the tower" [syn:
         foundation, base, fundament, foot, groundwork,
         substructure, understructure]