subsurface

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)A surface which is a submanifold of another surface.

1. Europa is thought to have subsurface liquid water.

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2. We thought Enceladus was just boring and cold until the Cassini mission discovered a liquid water subsurface ocean.

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