guinea pig

Noun
  1. A person who is subjected to experimental or other observational procedures;
    Someone who is an object of investigation (synset 110688105)
    "the subjects for this investigation were selected randomly"; "the cases that we studied were drawn from two different communities"
    is a type of: individual, mortal, person, somebody, someone, soul - a human being
    same as: case, subject
  2. Stout-bodied nearly tailless domesticated cavy;
    Often kept as a pet and widely used in research (synset 102367325)
    is a type of: cavy - short-tailed rough-haired South American rodent
    same as: cavia cobaya

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