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Definition of Guinea pig
1. Noun. A person who is subjected to experimental or other observational procedures; someone who is an object of investigation. "The cases that we studied were drawn from two different communities"
Generic synonyms: Individual, Mortal, Person, Somebody, Someone, Soul
Derivative terms: Subject
2. Noun. Stout-bodied nearly tailless domesticated cavy; often kept as a pet and widely used in research.
Definition of Guinea pig
1. Noun. A tailless rodent of the the family Caviidae and the genus ''Cavia'' genus, with short ears and larger than a hamster; the species ''Cavia porcellus'' is often kept as a pet. ¹
2. Noun. A rodent of any of several species within the family Caviidae. ¹
3. Noun. (figuratively) A living experimental subject. ¹
¹ Source: wiktionary.com
Medical Definition of Guinea pig
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)