follow Dictionary.com

Capitol vs. capital? What's the difference?

guinea pig

noun
1.
a short-eared, tailless rodent of the genus Cavia, usually white, black, and tawny, commonly regarded as the domesticated form of one of the South American wild species of cavy: often used in scientific experiments or kept as a pet.
2.
Informal. the subject of any sort of experiment.
Origin of guinea pig
1655-1665
1655-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the Web for guinea pig
Contemporary Examples
Historical Examples
  • Why has the guinea pig teeth that are shed before it is born?

  • A guinea pig, a guinea pig, a guinea pig, howled the student of heredity.

  • The young man put the guinea pig in his pocket, picked up his crutches, and we started down the sunny village street.

    Beautiful Joe Marshall Saunders
  • And they tried to get at Tom—but the guinea pig stood in the way.

    The Book of Dragons Edith Nesbit
  • Fig. 224 shows a very simple and convenient house for animals which do not gnaw through wood, as the rabbit and guinea pig.

    Carpentry and Woodwork Edwin W. Foster
  • This guinea pig's name was Jeff, and he and I became good friends.

    Beautiful Joe Marshall Saunders
  • So he and the two guinea pig children started off up the side of the mountain toward the cave.

    Buddy And Brighteyes Pigg Howard R. Garis
  • "A guinea pig, like all the others including us," his wife said.

    The Enormous Room Horace Leonard Gold
  • Besides the large Capivara and the little guinea pig, there are several intermediate kinds.

British Dictionary definitions for guinea pig

guinea pig

noun
1.
a domesticated cavy, probably descended from Cavia porcellus, commonly kept as a pet and used in scientific experiments
2.
a person or thing used for experimentation
Word Origin
C17: origin uncertain: perhaps from old use of the name Guinea to mean any remote unknown land
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for guinea pig

1660s, native to South America and perhaps so called either because it was first brought back to Britain aboard Guinea-men, ships that plied the triangle trade between England, Guinea, and South America [Barnhart, Klein]; or from confusion of Guinea (q.v.) with the South American region of Guyana (but OED is against this). In the extended sense of "one subjected to an experiment" it is first recorded 1920, because they were commonly used in vivisection experiments.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
guinea pig in Medicine

guinea pig guin·ea pig (gĭn'ē)
n.
Any of various small, short-eared domesticated rodents of the genus Cavia, having variously colored hair and no visible tail. They are widely kept as pets and often used as experimental animals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Slang definitions & phrases for guinea pig

guinea pig

noun

Person or thing used in an experiment, sometimes without agreement: the guinea pigs for her cooking

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
Cite This Source

Word of the Day

Difficulty index for guinea pig

Few English speakers likely know this word

Word Value for guinea

7
10
Scrabble Words With Friends

Nearby words for guinea pig