Ca·vy n.; pl. Cavies   Zool. A rodent of the genera Cavia and Dolichotis, as the guinea pig (Cavia cobaya). Cavies are natives of South America.
  Water cavy Zool., The capybara.
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  Guin·ea pig
  1. Zool. A small Brazilian rodent (Cavia porcellus or Cavia cobaya), about seven inches in length and usually of a white color, with spots of orange and black.  Called also cavy.  It is the domesticated form of the wild cavy, often kept as a pet and used commonly as an experimental animal in laboratory research.
  3. A contemptuous sobriquet. [Obs.] --Smollett
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  Cavia cobaya
       n : stout-bodied nearly tailless domesticated cavy; often kept
           as a pet and widely used in research [syn: guinea pig]