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English definition of “guinea pig”

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guinea pig

noun [C]
 
 
/ˈɡɪniˌpɪɡ/
ANIMAL a small animal with fur and no tail that people sometimes keep as a petRodents and similar animals
PERSON informal someone who is used in a test for something such as a new medicine or productTesting, checking and experimenting
(Definition of guinea pig from the Cambridge Learners Dictionary © Cambridge University Press)
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