We found 60 dictionaries that define the word placebo:

General (27 matching dictionaries)

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

Computing (1 matching dictionary)

26. Placebo (medicine), Placebo (origins of technical term), placebo: Encyclopedia

Medicine (27 matching dictionaries)

27. placebo: Merriam-Webster Medical Dictionary
28. Placebo: MedTerms.com Medical Dictionary
29. AIDSinfo Glossary (No longer online)
30. placebo: Natural Health glossary
31. Breast Cancer Talking Dictionary (No longer online)
32. online medical dictionary (No longer online)
33. Placebo: HIV/AIDS Glossary
34. Cancer Glossary (No longer online)
35. Placebo: Glossary of Terms Used in Medicinal Chemistry
36. Lay Terms for Consent Forms (No longer online)
37. Health and Wellness Dictionary (No longer online)
38. Hepatitis C Information Central (No longer online)
39. placebo: Prostate Cancer Interactive Glossary
40. Allergy Glossary (No longer online)
41. GI Disorders (No longer online)
42. Placebo: Breast Cancer Glossary of Medical Terms
43. AIDS Medical Glossary and Drug Chart (No longer online)
44. placebo: Dictionary of Cancer Terms
45. National Immunization Program Glossary (No longer online)
46. placebo: Parents' Common Sense Encyclopedia
47. Glossary of HIV/AIDS Related Terms (No longer online)
48. Placebo (medicine), Placebo (origins of technical term), placebo: Medical dictionary
49. Vitamin Glossary (No longer online)
50. WeMove Glossary of Terms (No longer online)
51. Placebo: Drug Medical Dictionary
52. Hyperdictionary (No longer online)
53. Dorland's Illustrated Medical Dictionary (No longer online)

Miscellaneous (2 matching dictionaries)

54. Placebo: Glossary of Terms in Parapsychology
55. placebo: A Word A Day

Science (2 matching dictionaries)

56. Placebo: Medicinal Chemistry
57. Statistics (No longer online)

Slang (1 matching dictionary)

58. placebo: Green’s Dictionary of Slang

(Note: See placeboes as well.)

Definitions from Wiktionary ( ) ▸ noun:  (medicine) A dummy medicine containing no active ingredients; an inert treatment. ▸ noun:  (Roman Catholicism) The vespers sung in the office for the dead. Similar: antiplacebo, nonplacebo, placebo effect, placebo button, bread pill, sugar pill, Obecalp, nostrum, nonstimulant, pseudo-medicine, more... Opposite: nocebo, active drug, control group Types: medicine, drug, treatment, cure, remedy, more... Phrases: placebo effect, placebo controlled, placebo effects, placebo response, active placebo, more... Adjectives: blind, double, randomized, powerful, randomised, inert, active, inactive, prospective, oral, identical Colors:     white,     gray,     beige,     light blue,     pale pink, more... ▸ Word origin ▸ Words similar to placebo ▸ Usage examples for placebo ▸ Idioms related to placebo ▸ Wikipedia articles (New!) ▸ Popular adjectives describing placebo ▸ Words that often appear near placebo ▸ Rhymes of placebo ▸ Invented words related to placebo