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well casing

noun
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Definition of well casing

1 : the tubular boring or drilling apparatus used in sinking a well and especially an oil well
2 : the tubular lining of a bored or drilled well

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“Well casing.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/well%20casing. Accessed 17 Jun. 2021.

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