Dictionary

borehole

borehole

noun bore·hole \ˈbr-ˌhōl\

; especially : a hole dug into the earth in order to find water or oil

Full Definition of BOREHOLE

:  a hole bored or drilled in the earth: as
a :  an exploratory well
b chiefly British :  a small-diameter well drilled especially to obtain water

First Known Use of BOREHOLE

1708

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