Latin subterraneus

← Proto-Indo-European *ters- (root)

← Latin sub- (affix)

← Latin terra (affix)

← Latin -āneus (affix)

→ English subterranean (borrowed)

→ English subterraneous (derived)

→ Esperanto subtera (mention)

→ French souterrain (derived)

→ Italian sotterraneo (derived)

→ Romanian subteran (borrowed)