Synonym: subterraneous, ulterior. Similar words: mediterranean, subterfuge, errant, aberrant, terra, fool's errand, terrain, terrarium. Meaning: [‚sʌbtə'reɪnɪən] 
adj. 1. being or operating under the surface of the earth 2. lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed).
adj. 1. being or operating under the surface of the earth 2. lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed). 
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(61) FS- Reflexion is a geophysical measuring instrument to locate subterranean voids like caves, bunkers, tunnels or basement vaults.
(62) In this diagram a high amplitude at specific frequencies indicates existing subterranean voids.
More similar words: mediterranean, subterfuge, errant, aberrant, terra, fool's errand, terrain, terrarium, terra firma, terraced house, one after another, undoubtedly, one another, erratic, erratum, leaned, erratically, aberration, currant, warrant, arrange, crane, far and near, warranty, rearrange, warranted, disarrange, membrane, intranet, prearranged.