Definitions of subterranean:
- adjective: lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
Example: "Subterranean motives for murder"
- adjective: being or operating under the surface of the earth
Example: "Subterranean passages"
Search for subterranean at other dictionaries: OneLook, Answers.com, Merriam-Webster
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