UNDERSURFACE
Meaning of UNDERSURFACE in English
I. ˈən-dər-ˌsər-fəs noun
Date: 1733
: underside
II. ˌən-dər-ˈsər-fəs adjective
Date: circa 1934
: existing or moving below the surface
Merriam-Webster's Collegiate English vocabulary.
Энциклопедический словарь английского языка Merriam Webster.
2003