tetra

Etymology

From translingual Tetragonopterus, an obsolete genus that included these fish.

noun

  1. Any of numerous species of small South American freshwater fish of the family Characidae, popular in home aquariums.
    Among them were ancient relatives of the piranhas and those popular aquarium fish the tetras, along with garfish and freshwater coelacanths, known as mawsonids. 2018, Tim Flannery, Europe: A Natural History, page 32

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