Etymology

pacu

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Today it means: Any of certain freshwater fish of the family Serrasalmidae, endemic to South America; they are characterised by squarish, human-like teeth and a mainly herbivorous diet. Full definition →

Portuguese pacu ← Old Tupi paku
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The story

  1. Old Tupi · derived frompaku
  2. Portuguese · borrowed frompacu
  3. English todaypacu

From Portuguese pacu, from Old Tupi paku.

Etymology from Wiktionary, CC BY-SA 4.0.