Siamese fighting fish
noun
a labyrinth fish, Betta splendens, that has been bred for centuries to develop brilliant coloration, very long fins, and pugnacity.
Origin of Siamese fighting fish
First recorded in 1930–35
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British Dictionary definitions for siamese fighting fish
Siamese fighting fish
noun
a brightly coloured labyrinth fish, Betta splendens, of Thailand and Malaysia, having large sail-like fins: the males are very pugnacious
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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