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Added 9 October 2026

subsurface

noun

noun Definition from Wiktionary (CC BY-SA). More about subsurface at Wordnik → Where our words come from →

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.
A surface which is a submanifold of another surface.

adjective

Below the surface.
variations in subsurface conditions

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