From The Collaborative International Dictionary of English v.0.44 [gcide]:
Subterranean \Sub'ter*ra"ne*an\, Subterraneous \Sub'ter*ra"ne*ous\, adjective [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}, adverb
From WordNet (r) 2.0 [wn]:
adjective
1: being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water" [syn: {subterraneous}]
2: lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell [syn: {subterraneous}, {ulterior}]
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