borehole Meaning, definition in Cambridge English Dictionary
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Meaning of "borehole" - English Dictionary

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boreholenoun [C]

uk   /ˈbɔː.həʊl/  us   /ˈbɔːr.hoʊl/
a deep hole made in the ground when looking for oil, gas, or water: We must sink a borehole so that people will have water. They obtained information about the rock by drilling boreholes.
(Definition of borehole from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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