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3 definitions found
 for guinea pig
From The Collaborative International Dictionary of English v.0.48 :

  Guinea pig \Guin"ea pig`\ [Prob. a mistake for Guiana 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.
        [Webster 1913 Suppl. +PJC]
     2. Hence, [figuratively]: Any animal or person used in an
        experiment; -- also applied to people who are unwillingly
        or unknowingly subjected by authorities to policies or
        procedures which might cause bodily or mental harm.
     3. A contemptuous sobriquet. [Obs.] --Smollett
        [Webster 1913 Suppl. +PJC]

From WordNet (r) 3.0 (2006) :

  guinea pig
      n 1: a person who is subjected to experimental or other
           observational procedures; someone who is an object of
           investigation; "the subjects for this investigation were
           selected randomly"; "the cases that we studied were drawn
           from two different communities" [syn: subject, case,
           guinea pig]
      2: stout-bodied nearly tailless domesticated cavy; often kept as
         a pet and widely used in research [syn: guinea pig, Cavia

From Moby Thesaurus II by Grady Ward, 1.0 :

  33 Moby Thesaurus words for "guinea pig":
     Cape polecat, ape, bar, bear, cavy, chimp, chimpanzee, coon,
     ferret, foumart, glutton, groundhog, hedgehog, laboratory animal,
     monk, monkey, mousehound, opossum, patient, polecat, porcupine,
     possum, prairie dog, quill pig, raccoon, skunk, subject, testee,
     weasel, whistle-pig, wolverine, woodchuck, zoril

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