IPA: /ˈkɔːrər/
KK: /ˈkɔrər/
A tool used to remove the core from fruits, especially apples, making them easier to eat or prepare.
She used a corer to quickly remove the seeds from the apples before baking a pie.
Corer is formed from "core" (from Old French *coeur*, meaning the central part or heart) and "-er" (meaning a person who). A corer is a person or tool that removes the central part of something, typically fruit.
Think of someone who removes the 'heart' ('core') of a fruit — that's what a corer does.