subsurface

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 support it.
 * 1)  A surface which is a submanifold of another surface.

Translations

 * Tagalog: kubdayag

Adjective

 * 1) Below the surface.
 * variations in subsurface conditions

Translations

 * Hungarian: felszín alatti
 * Polish:
 * Russian:
 * Ukrainian: підповерхне́вий

Etymology
From.

Adverb

 * 1) subsurfacely, below the surface