subterranean

[ suhb-tuh-rey-nee-uh n ]
/ ˌsʌb təˈreɪ ni ən /

adjective 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.

noun

a person or thing that is subterranean.
a subterrane.

Origin of subterranean

1595–1605; < Latin subterrāne(us) (see subterrane) + -an

OTHER WORDS FROM subterranean

sub·ter·ra·ne·an·ly, sub·ter·ra·ne·ous·ly, adverb

Words nearby subterranean

subtenure, subterfuge, subterminal, subternatural, subterrane, subterranean, subterrestrial, subtext, subthalamic nucleus, subthalamus, subtherapeutic

Example sentences from the Web for subterraneous

British Dictionary definitions for subterraneous

subterranean
/ (ˌsʌbtəˈreɪnɪən) /

adjective

Also: subterraneous, subterrestrial situated, living, or operating below the surface of the earth
existing or operating in concealment

Derived forms of subterranean

subterraneanly or subterraneously, adverb

Word Origin for subterranean

C17: from Latin subterrāneus, from sub- + terra earth