subsurface
adjective/ˈsʌbˌsɜrfɪs/
Frequency rank: #14,542 most common English word
Meaning
existing or occurring below the surface, especially of the earth.

Example sentence
The engineers used special equipment to detect subsurface water beneath the desert.
Synonyms & related words
- underground
- buried
- subterranean
- below-ground
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