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.
© Webster 1913.