Substruction \Sub*struc"tion\, n. [L. substructio, fr.
substruere, substructum, to build beneath; sub under +
struere to build.] (Arch.)
Underbuilding; the foundation, or any preliminary structure
intended to raise the lower floor or basement of a building
above the natural level of the ground.
[1913 Webster]
It is a magnificent strong building, with a
substruction very remarkable. --Evelyn.
[1913 Webster]