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The Collaborative International Dictionary
Subterraneously

Subterranean \Sub`ter*ra"ne*an\, Subterraneous \Sub`ter*ra"ne*ous\, a. [L. subterraneus; sub under + terra earth. See Terrace.] 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.

Wiktionary
subterraneously

adv. In a subterraneous manner; underground.

Usage examples of "subterraneously".

Second Pyramid, nearly buried in the drifting sands, yawns subterraneously south-east of the Sphinx.