[kawr-er, kohr-]
a person or thing that cores.
a knife or other instrument for coring apples, pears, etc.
a device having a hollow cylindrical drill or tube, used for taking samples of earth, rock, etc., from below the surface of the ground or ocean bottom.

1790–1800; core1 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To corer
Example sentences
The gravity corer requires a power winch as well, to deploy and retrieve the
Sediment sampling devices include a box corer that drops into the mud and
  brings back a block of near-surface sediment.
Corer deployment can also be difficult under certain conditions.
The main corer is held in position until a weight suspended from the trigger
  arm contacts the sea floor.
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