a hole dug or drilled downward, as in a mine or a petroleum or gas well.
occurring or situated in such a hole.

down1 + hole Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
downhole (ˈdaʊnˌhəʊl)
(in the oil industry) denoting any piece of equipment that is used in the well itself

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
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.
Any problems that occur downhole must be correctly identified and repaired.
The feasibility and initial development of downhole instruments and techniques.
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