Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various tropical American freshwater fishes of several genera, especially Serrasalmus and Pygocentrus, that have sharp teeth and are known for attacking and feeding on live animals.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of the carnivorous freshwater fish living in South American rivers and belonging to the families of Serrasalmus and Pygocentrus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun small voraciously carnivorous freshwater fishes of South America that attack and destroy living animals
  • noun someone who attacks in search of booty

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Portuguese, from Tupí : pirá, fish + ánha, teeth.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

First attested in 1869. The first part of the term is from Ere pirá ("fish"). There are three theories regarding the source of second part:

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