Usually means: Small rodent used for experiments.
Definitions Related words Phrases Mentions
We found 33 dictionaries that define the word guinea pig:

General (24 matching dictionaries)
  1. guinea pig: Merriam-Webster
  2. guinea pig: Oxford Learner's Dictionaries
  3. guinea pig: American Heritage Dictionary of the English Language
  4. guinea pig: Collins English Dictionary
  5. guinea pig: Vocabulary.com
  6. Guinea-pig, guinea-pig, guinea pig: Wordnik
  7. guinea pig: Cambridge Advanced Learner's Dictionary
  8. guinea-pig, guinea pig: Wiktionary
  9. guinea pig: The Wordsmyth English Dictionary-Thesaurus
  10. guinea pig: Infoplease Dictionary
  11. guinea pig: Dictionary.com
  12. Guinea pig: Online Etymology Dictionary
  13. Guinea Pig (TV series), Guinea Pig (film series), Guinea Pig, Guinea-pig, Guinea pig (disambiguation), Guinea pig, The Guinea Pig (Chetham-Strode), The Guinea Pig (film), The Guinea Pig (play): Wikipedia, the Free Encyclopedia
  14. guinea pig: Rhymezone
  15. guinea-pig: Webster's 1828 Dictionary
  16. Guinea-pig: E Cobham Brewer, The Reader's Handbook
  17. guinea pig: FreeDictionary.org
  18. guinea pig: Mnemonic Dictionary
  19. Guinea Pig: The Word Detective
  20. guinea-pig, guinea pig: TheFreeDictionary.com
  21. Guinea pig: World Wide Words
  22. guinea pig: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. Guinea-pig, guinea pig: Encyclopedia

Medicine (5 matching dictionaries)
  1. guinea pig: Merriam-Webster Medical Dictionary
  2. Guinea pig: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. Guinea-pig, guinea pig: Medical dictionary
  5. Guinea pig: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)
  1. GUINEA PIG, GUINEA PIG, GUINEA PIG: Terminology and Descriptions of Geneaological Words

Slang (2 matching dictionaries)
  1. Guinea Pig (offensive): Racial Slur Database
  2. guinea pig, guinea pig: Green’s Dictionary of Slang

(Note: See guinea_pigs as well.)

Definitions from Wiktionary (guinea pig)

noun:  Any tailless rodent of the genus Cavia, which have short ears and superficially resemble large hamsters.
noun:  (especially) A domestic guinea pig, Cavia porcellus, often kept as a pet.
noun:  (figuratively) A living experimental subject.
noun:  (dated, slang) A professional company director, without time or real qualifications for the duties.
noun:  (nautical, obsolete) A midshipman in the East India service; (by extension) a low-skilled or non-proficient seaman.

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