IPA: /ˈiːtə/
KK: /ˈitər/
A person or animal that consumes food.
The hungry eater finished the entire pizza by themselves.
Eater → It is formed from "eat" (from Old English "etan", meaning to consume food) and "-er" (meaning a person who). An eater is a person who consumes food.
Think of someone who 'consumes food' — 'eat' means to consume, and '-er' indicates a person. This helps you remember that an eater is someone who eats.