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Definition of Subterranean
1. Adjective. Being or operating under the surface of the earth. "A subsurface flow of water"
2. Adjective. Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed). "Looked too closely for an ulterior purpose in all knowledge"
Definition of Subterranean
1. a. Being or lying under the surface of the earth; situated within the earth, or under ground; as, subterranean springs; a subterraneous passage.
Definition of Subterranean
1. [adj]