[ˈɡɪnɪ pɪɡ], (Noun)

Definitions:
- a tailless South American rodent of the cavy family. Originally raised for food, it no longer occurs in the wild and is now typically kept as a pet or for laboratory research

- a person or thing used as a subject for experiment
(e.g: we were used as guinea pigs to test the effects of radiation on human beings)


Phrases:

Origin:
mid 17th century: from Guinea + pig; the term Guinea was probably a designation for an unknown distant country. Use in guinea pig arose in the 1920s in reference to the animal's use in laboratory research