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filefish

[fahyl-fish]
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noun, plural (especially collectively) file·fish, (especially referring to two or more kinds or species) file·fish·es.
  1. any of several flattened marine fishes of the family Monacanthidae, having an elongated head with a small mouth and small, spiny scales.
  2. a triggerfish.
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Origin of filefish

First recorded in 1765–75; file2 + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for filefish

filefish

noun plural -fish or -fishes
  1. any tropical triggerfish, such as Alutera scripta, having a narrow compressed body and a very long dorsal spine
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Word Origin

C18: referring to its file-like scales
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