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Siamese fighting fish

noun
  1. a labyrinth fish, Betta splendens, that has been bred for centuries to develop brilliant coloration, very long fins, and pugnacity.
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Origin of Siamese fighting fish

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for siamese fighting fish

Siamese fighting fish

noun
  1. a brightly coloured labyrinth fish, Betta splendens, of Thailand and Malaysia, having large sail-like fins: the males are very pugnacious
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012