downhole

[doun-hohl]

down·hole

[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.

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Downhole is always a great word to know.
So is doohickey. Does it mean:
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.

Origin:
down1 + hole
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To downhole
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
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