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[doun-hohl] /ˈdaʊnˌhoʊl/
a hole dug or drilled downward, as in a mine or a petroleum or gas well.
occurring or situated in such a hole.
Origin of downhole
down1 + hole Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for downhole
  • Over the past several years, sensors for collecting data downhole have grown increasingly sophisticated.
  • downhole mud driven turbine generator power appears to be a viable power option, particularly for the high temperature market.
  • The tool consists of an ultrasonic transducer coupled with a downhole inclinometer.
  • Borehole-flow rates can be calculated from downhole-velocity measurements and borehole diameter recorded by the caliper log.
  • Any problems that occur downhole must be correctly identified and repaired.
  • Shut in well at wing valve or by using a downhole shut-in tool.
  • The feasibility and initial development of downhole instruments and techniques.
British Dictionary definitions for downhole


(in the oil industry) denoting any piece of equipment that is used in the well itself
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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