A South American freshwater fish with large teeth and a voracious appetite, known for its aggressive feeding behavior; also spelled piranha in some regions.
From Tupi (Brazilian indigenous language) guara or gwara, meaning roughly 'fish eater' or 'bite'; Portuguese and Spanish colonizers borrowed the term from indigenous peoples.
Guaras are the original piranhas—the name came from Tupi peoples who knew these fierce fish long before they terrified European colonizers!
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