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guinea pig definition

guinea pig

  1. any of various small, plump rodents (genus Cavia) with short ears and no external tail: often domesticated and used in biological experiments
  2. ☆ any person or thing used in an experiment or test

Etymology: prob. orig. brought to England by ships plying between England, Guinea, and South America

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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