hatchetfish

[hach-it-fish]
noun, plural (especially collectively) hatchetfish (especially referring to two or more kinds or species) hatchetfishes.
1.
any deep-sea fishes of the genera Argyropelicus, Sternoptyx, and related genera, of tropical and temperate waters, having a silvery, hatchet-shaped body.
2.
Also called flying characin. any of several freshwater fishes of the genera Carnegiella, Gasteropelecus, and Thorachocharax, occurring from Panama to the Rio de la Plata and capable of flying short distances by rapid movements of their large pectoral fins.

Origin:
1930–35; hatchet + fish

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

hatchetfish

any member of two unrelated groups of hatchet-shaped fishes-deep-sea forms of the family Sternoptychidae or freshwater fishes of the family Gasteropelecidae.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The hatchetfish has upward-oriented eyes that allow it to gauge the position of prey above it.
The hatchetfish appears shiny because of its light-producing photophores.
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