subsurface

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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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