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Definition of: subterranean
(sub′tə·rā′nē·ən) adjective 
1. Situated or occurring below the surface of the earth: contrasted with subaerial and surficial; underground. 
2. Hidden. Also sub′ter·ra′ne·al, sub′ter·ra′ne·ous, sub′ter·rene′ (-tə·rēn′).
 
				
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