pi·ra·nha also pi·ra·ña (pĭ-rän'yə, -rān'yə, -rä'nə, -rān'ə) n. Any of several tropical American freshwater fishes of the genus Serrasalmus that are voraciously carnivorous and often attack and destroy living animals. Also called caribe.
[Portuguese, from Tupi : pirá, fish + ánha, to cut.]