betta
/ˈbɛtə/
noun
- A small, brightly colored freshwater fish, often kept as a pet in aquariums, known for its long fins and aggressive behavior toward other males.
- My son has a blue betta in a small tank on his desk.
- Bettas are also called Siamese fighting fish because males fight each other.
- She feeds her betta special pellets and keeps the water warm.