[kawr-er, kohr-]
  1. a person or thing that cores.
  2. a knife or other instrument for coring apples, pears, etc.
  3. 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.

Origin of corer

First recorded in 1790–1800; core1 + -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for corer

Historical Examples of corer