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
Well, Florence, despite having a new guinea pig, Yelena is lonely.
—
Brian Davids, HollywoodReporter, 28 Apr. 2025
Reese does enjoy socializing with other female guinea pigs during her free roam time
Subscribe to continue reading this article.
—Staff Report, Hartford Courant, 12 Apr. 2025
Videos of his before-and-after photos and shoots with shelter pets — including dogs, cats, guinea pigs, rabbits and occasionally reptiles — inspired shelters from around the world to ask him for help and advice.
—Jen Reeder, Forbes, 20 Mar. 2025
Mickey's one solace throughout the four-and-a-third-year journey to Niflheim is his romance with security agent Nasha (Naomi Ackie), the only crew member who thinks of every version of him as a person rather than a human guinea pig.
—Megan McCluskey, TIME, 7 Mar. 2025
See All Example Sentences for guinea pig
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Brian Davids, HollywoodReporter, 28 Apr. 2025
Reese does enjoy socializing with other female guinea pigs during her free roam time
Subscribe to continue reading this article.
—Staff Report, Hartford Courant, 12 Apr. 2025
Videos of his before-and-after photos and shoots with shelter pets — including dogs, cats, guinea pigs, rabbits and occasionally reptiles — inspired shelters from around the world to ask him for help and advice.
—Jen Reeder, Forbes, 20 Mar. 2025
Mickey's one solace throughout the four-and-a-third-year journey to Niflheim is his romance with security agent Nasha (Naomi Ackie), the only crew member who thinks of every version of him as a person rather than a human guinea pig.
—Megan McCluskey, TIME, 7 Mar. 2025
See All Example Sentences for guinea pig
Cite this Entry
“Guinea pig.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guinea%20pig. Accessed 9 May. 2025.
Copy CitationMedical Definition
guinea pig
noun
guin·ea pig
ˈgin-ē-ˌ 
: 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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