[bawr-hohl, bohr-]
noun Mining.
a hole drilled in the earth, as for the purpose of extracting a core, releasing gas, oil, water, etc.

1700–10; bore1 + hole Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
borehole (ˈbɔːˌhəʊl)
a hole driven into the ground to obtain geological information, release water, etc

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
Cold water is pumped down a deep borehole and returns superheated to spin a
One solution would be to drill a second intersecting borehole before exploiting
  the site.
As an oil well is drilled casings are cemented in place at different depths to
  reinforce the borehole.
Hockey sticks are also seen in borehole, stalagmite and ice cores bing.
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