As an adjective subterranean
is below ground, under the earth, underground.
As a noun tarpit is
a geological occurrence where subterranean bitumen leaks to the surface, creating a lake of asphalt.
subterranean
English
Adjective
(
en adjective)
below ground, under the earth, underground
Synonyms
* subterraneous, subterrene, underground
Related terms
* terranean
tarpit
Noun
(
en noun)
a geological occurrence where subterranean bitumen leaks to the surface, creating a lake of asphalt
Derived terms
* Turing tarpit