the part of a building or construction entirely above its foundation or basement.
any structure built on something else.
the overlying framework or features of an organization, institution, or system, built or superimposed on a more fundamental base.
Nautical. any construction built above the main deck of a vessel as an upward continuation of the sides. Compare deckhouse.
the part of a bridge that rests on the piers and abutments.
anything based on or rising from some foundation or basis: a complex ideological superstructure based on two hypotheses.

1635–45; super- + structure

superstructural, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superstructure (ˈsuːpəˌstrʌktʃə)
1.  the part of a building above its foundation
2.  any structure or concept erected on something else
3.  nautical any structure above the main deck of a ship with sides flush with the sides of the hull
4.  the part of a bridge supported by the piers and abutments
5.  (in Marxist theory) an edifice of interdependent agencies of the state, including legal and political institutions and ideologies, each possessing some autonomy but remaining products of the dominant mode of economic production

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1645, from super- + structure.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

superstructure su·per·struc·ture (sōō'pər-strŭk'chər)
A structure above the surface.

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
As a fail-safe, he added straight, diagonal cables to stiffen the
The wind battered the thick windows and ripped past the superstructure with a
  buffeted keening.
The building makes use of the weathering cliffs for its superstructure.
The second drawing is of the mud brick superstructure surrounding the clay
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