Subterranean - Definition
subterranean
adj 1: being or operating under the surface of the earth;
"subterranean passages"; "a subsurface flow of water"
[syn: subterranean, subterraneous]
2: 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 [syn:
subterranean, subterraneous, ulterior]