bore-hole

borehole

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

Origin:
1700–10; bore1 + hole

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World English Dictionary
borehole (ˈbɔːˌhəʊl)
 
n
a hole driven into the ground to obtain geological information, release water, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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