SYN: Cavia porcellus.
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guin·ea pig 'gin-ē-. n a small stout-bodied short-eared nearly tailless domesticated rodent of the genus Cavia (C. cobaya) often kept as a pet and widely used in biological research called also cavy
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guin·ea pig (ginґe pig) [possibly a corruption of Guiana, South America + fancied resemblance to the domestic pig] Cavia cobaya, a rodent native to South America, much used in laboratory experiments.Medical dictionary. 2011.