downhole

[doun-hohl]
noun
1.
a hole dug or drilled downward, as in a mine or a petroleum or gas well.
adjective
2.
occurring or situated in such a hole.

Origin:
down1 + hole

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
downhole (ˈdaʊnˌhəʊl)
 
adj
(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
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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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