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guinea pig

 
pronunciation:
gI ni pIg
features:
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part of speech: noun
definition 1: 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.
 
definition 2: a person who is used to test new products or procedures.
I was the guinea pig for Mom's new recipe.
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  mammal, pet, rodent