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undersurface

[uhn-der-sur-fis] /ˈʌn dərˌsɜr fɪs/
noun
1.
underside; bottom surface.
adjective
2.
submerged; under the surface, as of water, earth, etc.:
the undersurface speed of a submarine.
Origin
1725-1735
1725-35; under- + surface
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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