From Longman Dictionary of Contemporary Englishcorercor‧er /ˈkɔːrə $ -ər/ noun [countable] DFUa specially shaped knife for taking the hard centres out of fruit
Examples from the Corpus
corer• Also, there is no portable submersible rotary corer that could do the job.• But an attempt to pull up a second core failed when the corer snagged and then broke off its cable. 