rare. [-NESS.] The quality of being subterranean.
1727. Bailey (vol. II.), Subteraneousness, the being under the Earth, or inclosed within the Surface, Bowels, or hollow Parts of the Earth.
1851. G. S. Faber, Many Mansions, 345. We find the same character of Centrical Subterraneousness given to the Locality of Hades in two Cognate passages of the Apocalypse.
