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lanternfish

or lan·tern fish

[lan-tern-fish]
noun, plural (especially collectively) lan·tern·fish, (especially referring to two or more kinds or species) lan·tern·fish·es.
  1. any of several small, deep-sea fishes of the family Myctophidae, having rows of luminous organs along each side, certain species of which migrate to the surface at night.
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Origin of lanternfish

First recorded in 1745–55; lantern + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018