also guinea-pig
(~s)
1.
If someone is used as a ~ in an experiment, something is tested on them that has not been tested on people before.
...a human ~...
Nearly 500,000 pupils are to be ~s in a trial run of the new 14-plus exams.
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2.
A ~ is a small furry animal without a tail. Guinea pigs are often kept as pets.
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