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Definition of siamese fighting fish
siamese fighting fish
Plural:Siamese fighting fish
siamese fighting fish Lexical Profile
CEFR
C1
Grade
6
Tier
2
Usage
Rare
• noun
1
A popular freshwater aquarium fish (Betta splendens) native to Southeast Asia, particularly Thailand, noted for the male's highly aggressive behavior towards other males and its vibrant, elaborately flowing fins.
Example
"The enthusiast carefully set up a separate tank for his new Siamese fighting fish to prevent it from attacking the other males."
Word Nuance & Usage
Commonly referred to simply as a 'betta' in the aquarium trade, though 'Betta' technically refers to an entire genus comprising many different species.
• Nearby Words
siamang
siamese algae eater
siamese crocodile
siamese fighting fish
sibbaldia
siberian iris
siberian tiger
Usage Trend
Historical frequency of usage in published text.
180019102020
Data source: Google Books Ngram Viewer
Cite this Entry
Wordmom. (2026). Definition of Siamese fighting fish. In Wordmom Dictionary. Retrieved Oct 16, 2026, from https://wordmom.com/dictionary/siamese fighting fish