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}]

2: stout-bodied nearly tailless domesticated cavy; often kept

as a pet and widely used in research [syn: {Cavia cobaya}]