Meaning ofguinea pigin English

Noun

1. a small rodent (Cavia porcellus) often kept as pet
   The researcher used a guinea pig for the laboratory experiment.
2. a type of tailless rodent (family Caviidae)
   Guinea pigs are popular pets due to their gentle nature.
3. a living being used for experimentation
   The scientist tested the new medicine on a guinea pig before human trials.