Subsurface
/sˈʌˌbsɜrfəs/
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Definition
(noun) Something that is below the layer that is on the surface.
Sentence Examples
Europa is thought to have subsurface liquid water.
Before we could lay the flooring we had to lay a subsurface under it to keep it flat and support it.
CEFR Practice Quiz
The researchers used a new radar system to map the ____ features of the ancient and buried town.