substructure

[suhb-struhk-cher, suhb-struhk-]
noun
1.
a structure forming the foundation of a building or other construction.
2.
the foundations, piers, and abutments upon which the trusses or girders of the spans of a bridge rest.
3.
any basic structure or organization.

Origin:
1720–30; sub- + structure

substructural, adjective
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Collins
World English Dictionary
substructure (ˈsʌbˌstrʌktʃə)
 
n
1.  a structure, pattern, etc, that forms the basis of anything
2.  a structure forming a foundation or framework for a building or other construction
 
sub'structural
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

substructure sub·struc·ture (sŭb'strŭk'chər)
n.
A tissue or structure wholly or partly beneath the surface.


sub·struc'tur·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Amyloid diseases share the same molecular substructure.
We do not have the homogenous substructure, with a population counted and
  accounted for in great detail.
It is not negating the reality of human population substructure.
The name of the game again is population substructure in the service of medical
  research.
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