The meaning of SUBTERRANEAN is being, lying, or operating under the surface of the earth. How to use subterranean in a sentence. Go Underground With Subterranean.

SUBTERRANEAN definition: existing, situated, or operating below the surface of the earth; underground. See examples of subterranean used in a sentence.

Add to word list under the ground: a subterranean passage / river (Definition of subterranean from the Cambridge Academic Content Dictionary © Cambridge University Press)

Jan 20, 2026 · Adjective subterranean (not comparable) Below ground, under the earth, underground.

sub•ter•ra•ne•an (sub′tə rā′ nē ən), adj. Also, sub′ter•ra′ne•ous. existing, situated, or operating below the surface of the earth; underground. existing or operating out of sight or secretly; hidden or secret. n. a …

1. existing, situated, or operating below the earth's surface; underground. 2. existing or operating out of sight or secretly. n. 3. a person or thing that is subterranean.

Definition of subterranean adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.