From Longman Dictionary of Contemporary Englishpiranhapi‧ra‧nha /pəˈrɑːnə $ -ˈrɑːnjə, -ˈrænə/ noun [countable] HBFa South American fish with sharp teeth that lives in rivers and eats flesh
Examples from the Corpus
piranha• I had a piranha inside me, I was being eaten alive.• The boto is certainly credited with keeping away the flesh-eating piranha fish.• He obviously thought she was a man-hungry piranha, and really who could blame him?• If piranhas can rip a horse to pieces in no time, surely even a seven foot long otter offers little challenge?• Hamsters, on the other hand, are a different kettle of piranhas altogether.• And finally, Matt Barton from Norwich can't get past the piranha pond in Creatures.Origin piranha (1700-1800) Portuguese Tupi 