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n. pl. tonguefish or tongue·fish·es
Any of various marine flatfishes of the family Cynoglossidae, having the posterior part of the body tapering to a point.

[From its tongue-shaped body.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tonguefish - left-eyed marine flatfish whose tail tapers to a pointtonguefish - left-eyed marine flatfish whose tail tapers to a point; of little commercial value
flatfish - any of several families of fishes having flattened bodies that swim along the sea floor on one side of the body with both eyes on the upper side
References in periodicals archive ?
Firstly, the description of the Trieste fish ranges from "flatfish" to "flounder-like," to "sole," suggesting that the observers were confident that the fish was of the order Pleuronectiformes (dabs, flounders, halibuts, plaice, sole, tonguefishes, turbots, and whiffs) of which there are 570 species, known to live in shallow to moderate depths in arctic, temperate, and tropical localities.
Other types of flatfish include sole (family Soleidae) and tonguefishes (family Cynoglossidae).
Switzer TS, Baltz DM, Allen RL, and Munroe TA: Habitat selection by sympatric tonguefishes (Symphurus: Cynoglossidae) in coastal Louisiana, USA: Unraveling seasonal, spatial, and size-specific patterns in resource utilisation.
1998 Systematics and ecology of tonguefishes of the genus Symphurus (Cynoglossidae: Pleuronectiformes) from the western Atlantic ocean.
Currently, the early life history stages of seven species of symphurine tonguefishes occurring in the eastern Pacific can be distinguished from each other by their melanistic pigmentation patterns.