— subterraneanly, subterraneously , adv.
/sub'teuh ray"nee euhn/ , adj. Also, subterraneous .
1. existing, situated, or operating below the surface of the earth; underground.
2. existing or operating out of sight or secretly; hidden or secret.
n.
3. a person or thing that is subterranean.
4. a subterrane.
[ 1595-1605; subterrane ( us ) (see SUBTERRANE) + -AN ]