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| the offspring of a zebra and a donkey. |
| a fool or simpleton; ninny. |
| guinea pig | |
| —n | |
| 1. | a domesticated cavy, probably descended from Cavia porcellus, commonly kept as a pet and used in scientific experiments |
| 2. | a person or thing used for experimentation |
| [C17: origin uncertain: perhaps from old use of the name Guinea to mean any remote unknown land] | |
guinea pig guin·ea pig (gĭn'ē)
n.
Any of various small, short-eared domesticated rodents of the genus Cavia, having variously colored hair and no visible tail. They are widely kept as pets and often used as experimental animals.