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.
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.
Using humans as guinea pigs in drug trials raises ethical concerns.
He agreed to be the guinea pig for the new treatment.