guinea pig Meaning in the Cambridge English Dictionary
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Meaning of “guinea pig” in the English Dictionary

"guinea pig" in British English

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guinea pignoun [C]

uk   us  

guinea pig noun [C] (ANIMAL)

a ​smallanimalcovered in ​fur with ​roundedears, ​shortlegs, and no ​tail, often ​kept as a ​pet by ​children

guinea pig noun [C] (TEST)

a ​person used in a ​scientifictest, usually to ​discover the ​effect of a ​drug on ​humans: They're ​asking for ​students to be ​guineapigs in ​theirresearch into the ​commoncold.
(Definition of guinea pig from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"guinea pig" in American English

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guinea pignoun [C]

 us   /ˈɡɪn·i ˌpɪɡ/
a ​small, ​furryanimal with ​roundedears, ​shortlegs, and no ​tail, often ​kept as a ​pet and for use in ​scientificexperiments 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 ​sonaccused 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)
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