Capybara definitions

kăp'ə-bär'ə, -băr'ə
A large semiaquatic rodent (Hydrochoerus hydrochaeris) of tropical South America, having short limbs and a vestigial tail and often attaining lengths of more than 1.2 meters (4 feet).
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Any of a family (Hydrochoeridae) of tailless, partially web-footed, South American rodents found in and around lakes and streams: the largest extant rodent, reaching a length of over 1.2 m (c. 4 ft)
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A semi-aquatic South American rodent, Hydrochoerus hydrochaeris, the largest living rodent.
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Origin of capybara

From Old Tupi; possibly from ka'apiûara (“slender leaf (grass) eater”), from kaá (“leaf”) + píi (“slender”) + ú (“eat”) + ara (agentive suffix).