Table of Contents POS
HYPHEN
COUNT IN NET
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
ROGET THESAURUS

WORDNET DICTIONARY

Adjective subterranean has 2 senses

• subterranean(s = adj.all) subterraneous - being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"
• subterranean(s = adj.all) subterraneous, ulterior - 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"

CIDE DICTIONARY

OXFORD DICTIONARY

ROGET THESAURUS

subterranean

Depth

N depth, deepness, profundity, depression, hollow, pit, shaft, well, crater, gulf, bowels of the earth, botttomless pit, hell, soundings, depth of water, water, draught, submersion, plummet, sound, probe, sounding rod, sounding line, lead, bathymetry, sonar, side-looking sonar, bathometer, deep, deep seated, profound, sunk, buried, submerged, subaqueous, submarine, subterranean, subterraneous, subterrene, underground, bottomless, soundless, fathomless, unfathomed, unfathomable, abysmal, deep as a well, bathycolpian, benthal, benthopelagic, downreaching, yawning, knee deep, ankle deep, beyond one's depth, out of one's depth, over head and ears, mark twine, mark twain.

For further exploring for "subterranean" in Webster Dictionary Online