Definition of subsurface in English:

subsurface

noun

  • The stratum or strata below the earth's surface.

    [as modifier] ‘the subsurface layer’
    • ‘It seeps through the earth to a subsurface water table, which flows horizontally to a stream bank.’
    • ‘Ground penetrating radar provides an image of the subsurface showing the internal structure of dunes.’
    • ‘It has been estimated that half the biomass of life on the Earth resides in the subsurface doing things other than photosynthesis.’
    • ‘Also, in some areas (rift valleys) they receive hydrothermal magmatic waters from the subsurface.’
    • ‘Strong, continuous stratal reflections characterize the shallow subsurface on the upper and middle shelf.’

Pronunciation:

subsurface

/ˈsʌbsəːfɪs/