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guinea pig a small mammal with short legs and no tail. Guinea pigs are rodents closely related to chinchillas and porcupines. Some science laboratories use guinea pigs for research and to test new medicines. Wild guinea pigs live in South America. [2 definitions]
pig iron iron from a blast furnace that has been cast into blocks. [2 definitions]
pig-out (slang) the act or an instance of overeating.