guinea pig

noun

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 in a Sentence

He volunteered to act as a guinea pig in the experiment.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Melissa concedes, agreeing to take in the guinea pig as long as Janine takes responsibility for caring for the animal. Ile-Ife Okantah, Vulture, 23 Oct. 2024 Employers don’t want to be the guinea pig in your experiment to find your next calling. Caroline Ceniza-Levine, Forbes, 19 Oct. 2024 That is because cats see guinea pigs as big hairy mice, which is their favorite prey. Nina Turner, Newsweek, 30 Oct. 2024 By creating digital twins of cancer patients, they could be used as virtual guinea pigs, recreating clinical trials to compare the effectiveness of treatments and predict how a patient is likely to respond. New Atlas, 28 Oct. 2024 See all Example Sentences for guinea pig 

Word History

First Known Use

1664, in the meaning defined at sense 1

Time Traveler
The first known use of guinea pig was in 1664

Dictionary Entries Near guinea pig

Cite this Entry

“Guinea pig.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guinea%20pig. Accessed 26 Nov. 2024.

Kids Definition

guinea pig

noun
1
: a small stocky rodent with short ears and a very short tail that is often kept as a pet and is used in biological research
2
: a person or thing experimented on

Medical Definition

guinea pig

noun
guin·​ea pig ˈgin-ē-ˌ How to pronounce guinea pig (audio)
: 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

More from Merriam-Webster on guinea pig

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