Usually means: Inactive substance mimics real treatment.
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We found 58 dictionaries that define the word placebo:

General (26 matching dictionaries)
  1. placebo: Merriam-Webster.com
  2. placebo: Oxford Learner's Dictionaries
  3. placebo: American Heritage Dictionary of the English Language
  4. placebo: Collins English Dictionary
  5. placebo: Vocabulary.com
  6. Placebo, placebo: Wordnik
  7. placebo: Cambridge Advanced Learner's Dictionary
  8. placebo: Wiktionary
  9. placebo: Webster's New World College Dictionary, 4th Ed.
  10. placebo: The Wordsmyth English Dictionary-Thesaurus
  11. placebo: Infoplease Dictionary
  12. placebo: Dictionary.com
  13. placebo: Online Etymology Dictionary
  14. placebo: Cambridge Essential American English Dictionary
  15. Placebo (album), Placebo (at funeral), Placebo (band), Placebo (disambiguation), Placebo (medicine), Placebo: Wikipedia, the Free Encyclopedia
  16. Placebo: Online Plain Text English Dictionary
  17. placebo: Webster's Revised Unabridged, 1913 Edition
  18. placebo: Rhymezone
  19. Placebo: AllWords.com Multi-Lingual Dictionary
  20. Placebo: E Cobham Brewer, The Reader's Handbook
  21. placebo: Free Dictionary
  22. placebo: Mnemonic Dictionary
  23. placebo: Dictionary/thesaurus
  24. Placebo: Dictionary of Phrase and Fable (1898)

Computing (1 matching dictionary)
  1. Placebo (medicine), Placebo (origins of technical term), placebo: Encyclopedia

Medicine (26 matching dictionaries)
  1. Placebo: MedTerms.com Medical Dictionary
  2. AIDSinfo Glossary (No longer online)
  3. placebo: Natural Health glossary
  4. Breast Cancer Talking Dictionary (No longer online)
  5. online medical dictionary (No longer online)
  6. Placebo: HIV/AIDS Glossary
  7. Cancer Glossary (No longer online)
  8. Placebo: Glossary of Terms Used in Medicinal Chemistry
  9. Lay Terms for Consent Forms (No longer online)
  10. Health and Wellness Dictionary (No longer online)
  11. Hepatitis C Information Central (No longer online)
  12. placebo: Prostate Cancer Interactive Glossary
  13. Allergy Glossary (No longer online)
  14. GI Disorders (No longer online)
  15. Placebo: Breast Cancer Glossary of Medical Terms
  16. AIDS Medical Glossary and Drug Chart (No longer online)
  17. placebo: Dictionary of Cancer Terms
  18. National Immunization Program Glossary (No longer online)
  19. placebo: Parents' Common Sense Encyclopedia
  20. Glossary of HIV/AIDS Related Terms (No longer online)
  21. Placebo (medicine), Placebo (origins of technical term), placebo: Medical dictionary
  22. Vitamin Glossary (No longer online)
  23. WeMove Glossary of Terms (No longer online)
  24. Placebo: Drug Medical Dictionary
  25. Hyperdictionary (No longer online)
  26. Dorland's Illustrated Medical Dictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. Placebo: Glossary of Terms in Parapsychology
  2. placebo: A Word A Day

Science (2 matching dictionaries)
  1. Placebo: Medicinal Chemistry
  2. Statistics (No longer online)

Slang (1 matching dictionary)
  1. placebo: Green’s Dictionary of Slang

(Note: See placeboes as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (medicine) A dummy medicine containing no active ingredients; an inert treatment.
noun:  (Roman Catholicism) The vespers sung in the office for the dead.

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