WordNet 3.0 Copyright © 2006 by Princeton University.
- 1. subterranean, subterraneous, subsurface (vs. overhead) (vs. surface)
- usage: being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"
- 2. subterranean, subterraneous, ulterior, covert (vs. overt)
- usage: 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
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See also: subterranean (Dictionary)