What is the Latin word for underground?

The usual Latin words for “underground” are subterrāneus, habitō, hypogaeus. The right choice depends on the sense; see the distinctions below.

English → Latin

“underground” in Latin

subterrāneusunderground, subterranean habitōto reside, inhabit, remain, dwell, live; to linger hypogaeussubterranean, underground; underworldly, chthonian

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

underground

sub terra (e.g., habitare, with verbs of rest; in Liv., the state after the act being considered, we have aliquem sub terra dimittere in locum saxo conseptum): subterraneus. An underground cellar, hypogeum or hypogaeum (Vitr.).

Quick answer

What is the Latin word for underground?: The usual Latin words for “underground” are subterrāneus, habitō, hypogaeus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.