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See more synonyms for tonguefish on Thesaurus.com
noun, plural (especially collectively) tongue·fish, (especially referring to two or more kinds or species) tongue·fish·es.
  1. any of several flatfishes of the family Cynoglossidae, having the tail tapered to a point.
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Origin of tonguefish

First recorded in 1645–55; tongue + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018