I.an under - building, foundation, substructure, Vitr. 1, 5: “maxima debet esse cura substructionum,” id. 6, 11: “maximae,” Caes. B. C. 2, 25: “insanae,” Cic. Mil. 20, 53; 31, 85; Liv. 38, 28; Front. Aquaed. 3, 5 sq.; Col. 1, 5, 9; v. substruo fin.
substructĭo , ōnis, f. substruo,