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

cold snap

a short period of cold weather

Word of the Day

Cleavage proves divisive in Cambridge’s words of 2014

by Alastair Horne,
December 19, 2014
​​​​ Other dictionaries may choose faddish novelties as their words of the year, but here at Cambridge, we like to do something different. We look for the words that have seen sudden surges in searches over the course of the year – words that have been baffling users of English and driven them

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More