Definitions

1. noun

A person or thing that defeats others, especially in a contest or competition

“The champion was a formidable defeater in the sports tournament.”

2. noun

A substance or agent that removes or destroys a particular substance or organism

“The defeater in the new cleaning product effectively removed the stubborn stain.”

3. verb

To defeat or overcome a particular challenge or opponent

“The team will defeater the current champion in the upcoming match.”