downhole

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English[edit]

Etymology[edit]

down- +‎ hole

Adjective[edit]

downhole

  1. Occurring in the drilled bore of an oil well either underground or undersea.
    • 2015, Ronald DiPippo, Geothermal Power Plants
      Pressure readings are taken downhole next to the feed zone and the total flow is measured on the surface using a separator.