Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “guinea pig”

See all translations

guinea pig

noun [C] uk   us  

guinea pig noun [C] (ANIMAL)

a small animal covered in fur with rounded ears, short legs, and no tail, often kept as a pet by children

guinea pig noun [C] (TEST)

a person used in a scientific test, usually to discover the effect of a drug on humans: They're asking for students to be guinea pigs in their research into the common cold.
(Definition of guinea pig from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of guinea pig?
Add Cambridge dictionaries to your browser to your website

Definitions of “guinea pig” in other dictionaries

Word of the Day

justice

fairness in the way people are dealt with

Word of the Day

A certain je ne sais quoi: French words and phrases used in English

by Liz Walter,
January 21, 2015
It is an odd irony that the more sophisticated your use of English is, the more likely you are to use French words and phrases. Or, to be more accurate, ones you know to be French – words such as ballet, au pair, abattoir, fiancé, café, and restaurant are so entrenched in

Read More 

flower beard noun

January 19, 2015
a beard adorned with flowers And some of said beard-rockers are even turning it up a notch, painting trend on top of trend with what’s come to be known as ‘the flower beard.’

Read More