0 a small animal with fur and no tail that people sometimes keep as a pet -- porcellino d’India
1 someone who is used in a test for something such as a new medicine or product -- cavia
2 a small animal, like a rabbit, with short ears and often kept as a pet. -- porcellino d’India
3 a person used as the subject of an experiment -- cavia
He was used as a guinea-pig for the new drug trials.