subterraneous
adjective
1 subterraneous
Being or operating under the surface of the earth.
synonym: subterranean.
Roget 208: deep, deep seated; profound, sunk, buried; submerged etc. 310; subaqueous, submarine, subterranean, subterraneous, subterrene†; ... show more
2 subterraneous
Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed).
synonyms: subterranean, ulterior.
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