core barrel

noun
(in a core drill) a length of pipe for holding rock cores while they are being extracted from the drill hole.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The vertical plates are bolted to the edges of horizontal former plates that
  are bolted to the inside surface of the core barrel.
If the bit becomes plugged or blocking off is suspected, the driller should
  stop drilling and pull the core barrel.
Closeup of the sample-freezing drive shoe and a core in a polycarbonate plastic
  liner removed from the core barrel.
With the core barrel extending beyond the bit, the system was designed to
  collect the core into the core barrel.
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