pi·ra·nha also pi·ra·ña 
(pĭ-ränə, -ränyə)
(pĭ-ränə, -ränyə)n.
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. Also called caribe.
[Portuguese, from Tupí : pirá, fish + ánha, teeth.]