substructure

from WordNet (r) 3.0 (2006)
substructure
    n 1: the basic structure or features of a system or organization
         [syn: {infrastructure}, {substructure}]
    2: 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}]
from The Collaborative International Dictionary of English v.0.48
Substructure \Sub*struc"ture\, n. [Pref. sub- + structure.]
   1. (Arch.) Same as {Substruction}.
      [1913 Webster]

   2. An under structure; a foundation; groundwork.
      [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
41 Moby Thesaurus words for "substructure":
      base, basement, basis, bearing wall, bed, bedding, bedrock, bottom,
      floor, flooring, fond, footing, foundation, fundament, fundamental,
      ground, grounds, groundwork, hardpan, infrastructure, pavement,
      principle, radical, riprap, rock bottom, rudiment, seat, sill,
      solid ground, solid rock, stereobate, stylobate, substratum,
      substruction, terra firma, underbuilding, undercarriage,
      undergirding, underpinning, understruction, understructure
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