subsurface
adjective
1. beneath the surface
- subsurface materials of the moon
Similar word(s): belowground, underground, submarine, undersea, submerged, submersed, underwater, subterranean, subterraneous
Sentences with subsurface as an adjective:
- variations in subsurface conditions
noun
1. Something that is below the layer that is on the surface.
- Before we could lay the flooring we had to lay a subsurface under it to keep it flat and supoort it.
2. (countable, mathematics) A surface which is a submanifold of another surface.