from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Something that is below the layer that is on the surface.
  • n. A surface which is a submanifold of another surface.
  • adj. below the surface

from The Century Dictionary and Cyclopedia

  • Being or occurring below the surface.
  • n. A three-dimensional continuum in a space of five dimensions.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. beneath the surface


from Wiktionary, Creative Commons Attribution/Share-Alike License

sub- +‎ surface


  • I can see how a trip to Mars could stimulate us to push spaceflight tech but having spent a tremendous amount of dough getting to Mars and having established that there was and possibly is water on Mars and maybe even microorganisms in subsurface seas, what then?

    Bolden Wants to Go to Mars - NASA Watch

  • Among their early findings: a surprising amount of water moves rapidly through fractures in subsurface bedrock during high-intensity storms, playing a greater role in raising pore pressure than had been thought and creating "hot spots" that can fail.

    The Liquid Earth

  • The cold, lightless and energy-poor conditions under the seafloor provide a promising research analog for the harsh conditions in subsurface Martian soil or near hydrothermal vents on Europa, Jupiter’s second moon.

    Barely Alive, Seafloor Microbes Might Resemble Exo-Organisms « Isegoria

  • This is called subsurface return flow or interflow.

    Surface runoff

  • Water that infiltrates the soil is called subsurface water, but not all of it becomes groundwater for the following reasons:

    Chapter 10

  • Dental fluorosis has been described as a subsurface enamel hypomineralization, with porosity of the tooth positively correlated with the degree of fluorosis. 22 It is characterized by diffuse opacities and under-mineralized enamel.

    Signs of the Times

  • Of greater concern is that the oil can flow out into the surrounding rocks the way the mud did during the failed Top Kill procedure, forming what is called a subsurface blowout.


  • Geothermal power utilizes the near constant temperature of the earth's subsurface, which is about 54 degrees, instead of using boilers to heat large volumes of very cold water by burning fossil fuels.

    The Roanoke Times: Home page

  • It was a convulsing mask, twitching and grimacing as it was stretched to the breaking point by some kind of subsurface conflict.

    The Sinister Six Combo

  • Brines trapped in the Earth’s crust (called subsurface brines) are the major source material for lithium carbonate.



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