Definitions

1. noun

a small mammal of the family Caviidae, native to Africa, often kept as a pet.

“The guinea pig is a popular choice for children learning about responsibility.”

2. noun

a person or group used as a test or control in a scientific experiment or social research.

“The company used a group of students as guinea pigs to test their new marketing strategy.”

3. noun

a person who is considered to be inexperienced or naive in a particular situation.

“She was a guinea pig in the world of high finance, having just graduated from college.”