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English definition of “guinea pig”

guinea pig

noun [C] uk   us  

guinea pig noun [C] (ANIMAL)

a small animal covered in fur with rounded ears, short legs, and no tail, often kept as a pet by children

guinea pig noun [C] (TEST)

a person used in a scientific test, usually to discover the effect of a drug on humans: They're asking for students to be guinea pigs in their research into the common cold.
(Definition of guinea pig from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of guinea pig?
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