guinea pig

guinea pig ( 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]
     2: stout-bodied nearly tailless domesticated cavy; often kept
        as a pet and widely used in research [syn: Cavia cobaya]