under structure

understructure

[uhn-der-struhk-cher]
noun
1.
a structure serving as a support; a base or foundation: The building has a strong understructure.
2.
any thing, condition, etc., establishing support; a basis: an argument that rests on a sound understructure of knowledge.

Origin:
under- + structure

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
understructure

noun
lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower" [syn: foundation
WordNet® 3.0, © 2006 by Princeton University.
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