undersurface

[uhn-der-sur-fis]
noun
1.
underside; bottom surface.
adjective
2.
submerged; under the surface, as of water, earth, etc.: the undersurface speed of a submarine.

Origin:
1725–35; under- + surface

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
One goal here is to study the surprisingly complicated undersurface of the ice.
The entire undersurface, side of the neck, and parts of the flippers are cream to yellow.
Using an iron set on moderate heat, iron the freezer paper patterns onto the wrong side of the undersurface wing fabric.
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