What does betta mean?
A betta is a small freshwater fish belonging to the genus Betta, native to the shallow waters of Southeast Asia. By far the best-known species is Betta splendens, the Siamese fighting fish, one of the most popular aquarium fish in the world. Bettas are prized for their intense colours — ranging from deep red and royal blue to iridescent turquoise — and, in domesticated males, for their dramatic, flowing fins. They are called fighting fish because territorial males will flare their gill covers and attack one another if housed together, though females are generally less aggressive. Unusually among fish, bettas possess a labyrinth organ that allows them to gulp air at the surface, enabling them to survive in oxygen-poor water such as rice paddies and slow streams. The word is used both for the species specifically and for the genus more broadly, and the plural is typically "bettas".
nounA small freshwater fish of the genus Betta, especially Betta splendens, the Siamese fighting fish, kept widely as an aquarium fish and known for its vivid colours and flowing fins.
- The Siamese fighting fish (Betta splendens), a popular aquarium fish with brilliant colouring and long fins.
- Any fish of the genus Betta, native to Southeast Asia.
"The male betta flared its crimson fins at its reflection in the glass."
"She keeps a single betta in a heated five-gallon tank."
"Wild bettas are far less flamboyant than the ornamental strains bred for aquariums."
The standard plural is "bettas"; the unchanged plural "betta" also occurs, particularly among aquarists.
"The shop had a row of jars, each holding a single male betta."
A betta can breathe air straight from the surface thanks to a special organ, which is why it can survive in water too stagnant for other fish.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of betta
The word "betta" entered English through scientific Latin, where the genus name Betta was established in the nineteenth century. Its ultimate source is generally thought to lie in a Southeast Asian language, likely via a Malay name for the fish, though the exact derivation remains debated. The term spread into general English usage as Betta splendens became a mainstay of the home aquarium trade.
How betta is actually used
In casual use, "betta fish" is a common redundant phrase since betta already denotes the fish. The plural is usually "bettas", though the unchanged form "betta" also appears.
Easily confused with betta
"Beta" is the second letter of the Greek alphabet (or a term for a testing phase), while "betta" is a noun naming a colourful fighting fish.