noun
The animal Cavia porcellus, commonly kept as a pet or used in laboratories.
from Dutch marmot
子供の頃、モルモットを飼っていました。
I kept a guinea pig when I was a child.
noun
Figurative use for a person or thing used as a subject in an experiment or trial.
新薬の治験で、彼はモルモットになった。
He became a guinea pig in the clinical trial for the new drug.