guinea pig - WordReference.com Dictionary of English

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  - Guillain–Barré syndrome
  - guillemot
  - guilloche
  - guillotine
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  - guinea pig
  - Guinea worm
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guinea pig

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Concise Oxford English Dictionary © 2008 Oxford University Press:
guinea pig

▶noun

1 a tailless South American cavy, now completely domesticated as a pet or laboratory animal. [Cavia porcellus.]

2 a person or thing used as a subject for experiment.

'guinea pig' also found in these Oxford entries:

agouti - boar - capybara - cavy - sow

Forum discussions with the word(s) "guinea pig" in the title:

Guinea Pig/ experiment
I need a guinea pig ?
rat, gerbil, guinea pig?
rat, rabbit, dermal rabbit, dermal guinea pig - meaning?

Ask in the forums yourself.Visit the English Only Forum.

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