different between substruction vs substraction

English

From Latin substructio, from substruere, substructum (“to build beneath”), from sub (“under”) + struere (“to build”).

substruction (plural substructions)

(architecture) 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.
- It is a magnificent strong building, with a substruction very remarkable.

Old French substraction, French soustraction.

substraction (countable and uncountable, plural substractions)

(obsolete) subtraction; deduction
- 1624, Henry Wotton, The Elements of Architecture
  The plasterer doth make his figures by addition, and the carver by substraction.

Send