guinea pig meaning and definition

GUINEA PIG noun

Definition of guinea pig (noun)

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"
   • synonyms: case, subject
2. stout-bodied nearly tailless domesticated cavy; often kept as a pet and widely used in research
   • synonyms: Cavia cobaya