Subterranean
Pronunciation : Sub`ter*ra"ne*an, Sub`ter*ra"ne*ous
Part of Speech : a.
Etymology : [L. subterraneus; sub under + terra earth. See Terrace.]
Definition : Defn: Being or lying under the surface of the earth; situated within the earth, or under ground; as, subterranean springs; a subterraneous passage. -- Sub`ter*ra"ne*ous*ly, adv.
Source : Webster's Unabridged Dictionary, 1913