SUBSURFACE

subsurface

(adjective) beneath the surface; “subsurface materials of the moon”

Source: WordNet® 3.1

Etymology

Noun

subsurface (plural subsurfaces)

Something that is below the layer that is on the surface.

(countable, mathematics) A surface which is a submanifold of another surface.

Adjective

subsurface (not comparable)

below the surface

Source: Wiktionary

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