nounplural noun pacu
A deep-bodied, herbivorous freshwater fish native to northern South America.
Colossoma nigripinnis, family Characidae‘Are the vegetarian pacu's teeth different from the carnivorous piranha's teeth?’
- ‘The introduction of these exotic species, such as the pacu, can have detrimental effects for native species inhabiting South Carolina waters.’
- ‘Additionally, full-grown pacu are much larger than piranha.’
Late 18th century from Tupi pacú.
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