adit /ˈæ.dɪt/ noun1 •A horizontal or nearly horizontal passage from the surface into a mine, as contrasted with a shaft or vertical entry passage, used for ventilation, haulage, drainage, or other purposes.It consisted of an opening in the forest which clothed the hillside with the black mouth of an adit in the midst of it, and a few big mounds of debris, beside which stood a rude log shanty. — 1910 formsadits
