noun, plural (especially collectively) catfish (especially referring to two or more kinds or species) catfishes.
any of the numerous fishes of the order or suborder Nematognathi (or Siluroidei), characterized by barbels around the mouth and the absence of scales.
a wolffish of the genus Anarhichas.
any of various other fishes having a fancied resemblance to a cat.
Slang. a person who assumes a false identity or personality on the Internet, especially on social-networking websites, as to deceive, manipulate, or swindle.
verb (used without object), verb (used with object)
Slang. to deceive, swindle, etc., by assuming a false identity or personality online: He fell in love with her online before he realized he'd been catfished.

1605–15; cat + fish Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
catfish (ˈkætˌfɪʃ)
n , pl -fish, -fishes
1.  any of numerous mainly freshwater teleost fishes having whisker-like barbels around the mouth, esp the silurids of Europe and Asia and the horned pouts of North America
2.  another name for wolffish

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Catfish, as seen in nature, are not the prettiest creatures.
Many plantations have given way to catfish farms, but these too are past their
  glory days.
One is to farm more vegetarian fish such as tilapia and catfish.
Everyone knows about corn meal, white or yellow, used for breading catfish and
  making corn bread.
Image for catfish
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