restrial

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• subterranean — I (New American Roget s College Thesaurus) adj. underground; infernal, Stygian, nether; hidden. See depth. II (Roget s IV) modif. 1. [Hidden] Syn. secret, furtive, concealed; see hidden 2 . 2. [Below ground] Syn. subsurface, sunk, sunken,… …   English dictionary for students