Dictionary

guinea pig

noun

: a small animal that is often kept as a pet

: a person or thing used for testing something

Full Definition of GUINEA PIG

1
:  a small stout-bodied short-eared tailless domesticated rodent (Cavia porcellus) of South American origin often kept as a pet and widely used in biological research —called also cavy
2
:  a subject of research, experimentation, or testing

Examples of GUINEA PIG

  1. He volunteered to act as a guinea pig in the experiment.

First Known Use of GUINEA PIG

1664

guinea pig

noun guin·ea pig \ˈgin-ē-ˌ\   (Medical Dictionary)

Medical Definition of GUINEA PIG

:  a small stout-bodied short-eared nearly tailless domesticated rodent of the genus Cavia (C. cobaya) often kept as a pet and widely used in biological research—called also cavy

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