Hypertext Webster Gateway: "superstructure"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Superstructure \Su`per*struc"ture\, n. [Cf. F. superstructure.]
1. Any material structure or edifice built on something else;
that which is raised on a foundation or basis; esp.
(Arch.), all that part of a building above the basement.
Also used figuratively.
You have added to your natural endowments the
superstructure of study. --Dryden.
2. (Railway Engin.) The sleepers, and fastenings, in
distinction from the roadbed.
From WordNet (r) 1.7 (wn)
superstructure
n : structure consisting of the part of a ship above the main
deck
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