I.a digging (postAug., whereas fossio is quite class.).
I. Lit.: “plana fossura,” Col. 4, 14, 2; Pall. 10, 14, 2.—In plur.: “complanata juga fossuris montium,” Suet. Calig. 37: “puteorum,” Vitr. 5, 9, 8; Col. 4, 28, 2.—
II. Transf., concr., a pit: “summa fossura operiatur arundinibus,” Vitr. 8, 1, 4.