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Definition of Cavia porcellus
1. Noun. South American cavy; possibly ancestral to the domestic guinea pig.
Medical Definition of Cavia porcellus
1. A rodent with a very short tail that is not visible externally; native to South America, where it is raised for food; used widely as a laboratory animal in bacteriologic, pathologic, and pharmacologic research. Synonym: guinea pig. (05 Mar 2000)