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Its common name is derived from Tupi ka'apiûara, a complex agglutination of kaá (leaf) + píi (slender) + ú (eat) + ara (a suffix for agent nouns), meaning "one who eats slender leaves", or "grass-eater".[4]
The scientific name, both hydrochoerus and hydrochaeris, comes from Greek ὕδρω (hydro "water") and χοῖρος (choiros "pig, hog").[5][6]