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Definition of guinea pig

guinea pig

Plural:guinea pigs
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• noun

1

A tailless, domesticated South American rodent (Cavia porcellus) belonging to the cavy family, widely kept as a pet and historically used in biological research.

Example

"The children were thrilled to adopt a fluffy Guinea pig from the local animal shelter."

2

A person or thing used as a subject for an experiment, trial, or test.

Example

"The developer asked her colleagues to act as Guinea pigs for the beta version of the new software application."

Synonyms
View all synonyms for guinea pig

• Nearby Words

guiltlessly
guilty
guinea
guinea pig
guinea-bissau
guineafowl
guinep

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Guinea pig. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/guinea-pig
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