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subterranean

sub·ter·ra·ne·an [ sùbtə ráynee ən ] or sub·ter·ra·ne·ous [ sùbtə ráynee əss ]


adjective 
Definition:
 
1. underground: existing or situated below ground level

2. secret: existing or carried on in secret

[Early 17th century. < Latin subterraneus "underground" < terra "earth, land"]

sub·ter·ra·ne·an·ly adverb
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