drill string

noun
(on a drill rig) the assemblage of drill pipes that link the drill bit to the mechanism that imparts rotary or reciprocating motion.

Origin:
1695–1705

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
drill string or drill pipe
 
n
(in the oil industry) a pipe made of lengths of steel tubing that is attached to the drilling tool and rotates during drilling to form a bore
 
drill pipe or drill pipe
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Drill string safety valve was installed but could not be closed.
The downhole guidance probe is positioned directly behind the downhole motor,
  thus becoming an integral part of the drill string.
At the end of the drill string, at the bottom of the hole, a drill bit grind s
  away at the rock.
During drilling, elevators are used to add additional pipe to the drill string
  as the depth increases.
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