Definition of guinea pig noun from the Oxford Advanced Learner's Dictionary

     

    guinea pig

     noun
    noun
    BrE
     
    ; NAmE
     
    Pets, Domesticated mammals
     
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  1. 1 a small animal with short ears and no tail, often kept as a pet See related entries: Pets, Domesticated mammals
  2. 2a person used in medical or other experiments Students in fifty schools are to act as guinea pigs for these new teaching methods.
  3. Extra examples She wants Burke to be the guinea pig in the experiment. The company used my client as a human guinea pig. Twenty students volunteered to act as guinea pigs.
See the Oxford Advanced American Dictionary entry: guinea pig