subsurface
Noun

subsurface (plural subsurfaces)

  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 support it.
  2. (countable, mathematics) A surface which is a submanifold of another surface.
Adjective

subsurface (not comparable)

  1. below the surface
    variations in subsurface conditions



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