guinea pig   (TTS Sound)

The noun guinea pig has 2 senses

• subject, case, guinea pig -- (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")


• guinea pig, Cavia cobaya -- (stout-bodied nearly tailless domesticated cavy; often kept as a pet and widely used in research)