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guinea pig

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noun
a short-eared, tailless rodent of the genus Cavia, usually white, black, and tawny, commonly regarded as the domesticated form of one of the South American wild species of cavy: often used in scientific experiments or kept as a pet.
Informal. the subject of any sort of experiment: I've volunteered as a guinea pig in several clinical trials.
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Origin of guinea pig

First recorded in 1655–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use guinea pig in a sentence

British Dictionary definitions for guinea pig

guinea pig

noun
a domesticated cavy, probably descended from Cavia porcellus, commonly kept as a pet and used in scientific experiments
a person or thing used for experimentation

Word Origin for guinea pig

C17: origin uncertain: perhaps from old use of the name Guinea to mean any remote unknown land
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for guinea pig

guinea pig
[ gĭnē ]

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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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