fossūra — Lewis & Short
fossūra, ae, f.fodio,
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.