superstruction

from The Collaborative International Dictionary of English v.0.48

Superstruction \Su`per*struc"tion\, n.
   1. The act of superstructing, or building upon.
      [1913 Webster]

   2. That which is superstructed, or built upon some
      foundation; an edifice; a superstructure.
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            My own profession hath taught me not to erect new
            superstructions upon an old ruin.     --Denham.
      [1913 Webster]