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guinea pig

guin·ea pig (plural guin·ea pigs)


noun 
Definition:
 
1. rodent kept as pet: a plump short-eared furry domesticated rodent that is similar to but larger than a hamster and is widely kept as a pet. Native to: South America.  Latin name Cavia porcellus.

2. somebody or something experimented on: somebody or something used as the subject of an experiment, test, or trial

[Mid-17th century. After the Guinea coast of W Africa, probably from confusion with Guyana]
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