structural

Etymology

19th century; structure + -al

adj

1. Of, relating to, or having structure.
   Class 1. consists of nervous diseases, such as depend on the nervous and muscular systems; the second, of sanguine diseases, such as depend on the sanguiferous system; the third, of secretory diseases, or such as are connected with the state of the secretions; and the fourth, of structural diseases, or those that are connected with the nutritive powers. 1814, Thomas Young, “An Introduction to Medical Literature, including a System of practical Nosology”, in The Monthly Review, page 185
2. Involving the mechanics of construction.
3. That is lasting. economics

noun

1. Structural steel, used in construction.
   Freight differentials often increased the spread in favor of the imported structurals. Purchasers repeatedly emphasized that their purchases of imported structurals were split among a number of sources, including Spain, France, West Germany, […] 1982, United States International Trade Commission, Certain carbon steel products from Spain (page A-49)