Definition of piranha noun from the Oxford Advanced Learner's Dictionary

 

piranha

 noun
noun
BrE BrE//pɪˈrɑːnə//
 
; NAmE NAmE//pɪˈrɑːnə//
 
Fish
 
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a small S American freshwater fish that attacks and eats live animals See related entries: Fish Word Origin mid 18th cent.: via Portuguese from Tupi-Guarani pirá ‘fish’ + sainha ‘tooth’.
See the Oxford Advanced American Dictionary entry: piranha