Source : Webster's Revised Unabridged Dictionary (1913)

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

   2. That which id superstructed, or built upon some
      foundation; an edifice; a superstructure.

            My own profession hath taught me not to erect new
            superstructions upon an old ruin.     --Denham.