souterrainement

== French == === Etymology === From souterrain +‎ -ment. === Pronunciation === IPA(key): /su.tɛ.ʁɛn.mɑ̃/ ~ /su.te.ʁɛn.mɑ̃/ === Adverb === souterrainement subterraneously === Further reading === “souterrainement”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012