1) American adventure novel 2) Hidden or secret 3) Of the nether world 4) Subsurface 5) Subterraneous 6) Underground 1) Belowground 2) Bottomless 3) Covert 4) Hypogeal 5) Nether 6) Subsurface 7) Subterraneous 8) Subterrestrial 9) Ulterior 10) Underground 
below ground
• (a.) Alt. of Subterraneous
Below ground; plants which spend their life cycle below ground.
Pertaining to underground environments (in karst).
Any of the various sub-species of humanity who dwell beneath the Earth's surface.
below ground
[adj] - being or operating under the surface of the earth 2. [adj] - lying beneath what is revealed or avowed, especially being deliberately concealed
subterranean 1. Situated or operating beneath the earth's surface; underground.2. Hidden; secret; such as, subterranean motives for murder.
subterraneous adjective being or operating under the surface of the earth; `subterranean passages`; `a subsurface flow of water`
living under the surface of the earth
existing, situated, or operating below the surface of the earth; underground. · existing or operating out of sight or secretly; hidden or secret.
being or operating under the surface of the earth being or operating under the surface of the earth
being or operating under the surface of the earth