underside; bottom surface.


submerged; under the surface, as of water, earth, etc.: the undersurface speed of a submarine.

Origin of undersurface

First recorded in 1725–35; under- + surface
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for undersurface

Historical Examples of undersurface

  • The nest was some forty feet from the ground, on the undersurface of a shelf of rock.

    The Red Dust

    Murray Leinster

  • He pointed with his antennae to the fluorescent hieroglyphs on the undersurface of the saucer-ship.

    Clean Break

    Roger Dee

  • The undersurface, originally a bright red, turns brown and runs in every direction into a mass of dark stalactites.

    The Life of the Fly

    J. Henri Fabre

  • There had been a lot of that at first, in the early days before the transfer to undersurface was complete.

    The Defenders

    Philip K. Dick

  • Until our families can come up from undersurface, it's going to be pretty lonesome, but we'll have to manage.

    The Defenders

    Philip K. Dick