Meaning of “guinea pig” in the English Dictionary

"guinea pig" in American English

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guinea pignoun [ C ]

us /ˈɡɪn·i ˌpɪɡ/

a small, furry animal with rounded ears, short legs, and no tail, often kept as a pet and for use in scientific experiments

fig. A guinea pig is also a person used in a test, esp. one to discover how effective a new drug or process is:

Her own son accused her of having used him as a guinea pig to test her theories about the education of children.

(Definition of “guinea pig” from the Cambridge Academic Content Dictionary © Cambridge University Press)