01 n. Any material structure or edifice built on something else; that which is raised on a foundation or basis
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1.
Any material structure or edifice built on something else; that which is raised on a foundation or basis(Arch.)“You have added to your natural endowments the superstructure of study.” — Dryden.
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2.
The sleepers, and fastenings, in distinction from the roadbed.(Railway Engin.)