subterranean /ˌsʌbtəˈɹeɪniən/adjective 2noun 1forms 1 adjective2 •Below ground, under the earth, underground.And you were in the parking lot / Subterranean by your own design — 1975 •Secret, concealed. noun1 •Someone or something that is subterranean.Prue found an ample subterranean, neatly furnished; […] — 1906 formssubterraneans
