subsurface

sub·sur·face

 (sŭb′sûr′fəs, sŭb-sûr′-)

adj.

Of, relating to, or situated in an area beneath a surface, especially the surface of the earth or of a body of water.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Thesaurus

Adj.

1.

subsurface - beneath the surface; "subsurface materials of the moon" overhead - located or originating from above; "an overhead crossing" surface - on the surface; "surface materials of the moon"

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