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We found 44 dictionaries with English definitions that include the word penicillin:
Click on the first link on a line below to go directly to a page where "penicillin" is defined.

General dictionaries General (29 matching dictionaries)
  1. penicillin: Merriam-Webster.com [home, info]
  2. penicillin: Oxford Learner's Dictionaries [home, info]
  3. penicillin: American Heritage Dictionary of the English Language [home, info]
  4. penicillin: Collins English Dictionary [home, info]
  5. penicillin: Vocabulary.com [home, info]
  6. penicillin: Macmillan Dictionary [home, info]
  7. Penicillin, penicillin: Wordnik [home, info]
  8. penicillin: Cambridge Advanced Learner's Dictionary [home, info]
  9. penicillin: Wiktionary [home, info]
  10. penicillin: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. penicillin: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. penicillin: Infoplease Dictionary [home, info]
  13. penicillin: Dictionary.com [home, info]
  14. penicillin: Online Etymology Dictionary [home, info]
  15. penicillin: UltraLingua English Dictionary [home, info]
  16. penicillin: Cambridge Dictionary of American English [home, info]
  17. Penicillin (band), Penicillin (counter-artillery system), Penicillin: Wikipedia, the Free Encyclopedia [home, info]
  18. penicillin: Rhymezone [home, info]
  19. penicillin: AllWords.com Multi-Lingual Dictionary [home, info]
  20. penicillin: Hutchinson's Dictionary of Difficult Words [home, info]
  21. Penicillin: Encarta® Online Encyclopedia, North American Edition [home, info]
  22. penicillin: Free Dictionary [home, info]
  23. penicillin, penicillin: Hutchinson Dictionaries [home, info]
  24. penicillin: Mnemonic Dictionary [home, info]
  25. penicillin: WordNet 1.7 Vocabulary Helper [home, info]
  26. penicillin: LookWAYup Translating Dictionary/Thesaurus [home, info]
  27. penicillin: Dictionary/thesaurus [home, info]

Business dictionaries Business (1 matching dictionary)
  1. penicillin: Legal dictionary [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. penicillin: Encyclopedia [home, info]

Medicine dictionaries Medicine (10 matching dictionaries)
  1. Penicillin: MedTerms.com Medical Dictionary [home, info]
  2. Penicillin: Merck Manuals [home, info]
  3. penicillin: online medical dictionary [home, info]
  4. Penicillin: Allergy Glossary [home, info]
  5. penicillin: Dictionary of Cancer Terms [home, info]
  6. generic/penvk.htm">Penicillin: RxList The Internet Drug Index [home, info]
  7. Penicillin (Pen): Microbial Genetics Glossary [home, info]
  8. penicillin: Medical dictionary [home, info]
  9. Penicillin: Drug Medical Dictionary [home, info]
  10. penicillin: Hyperdictionary [home, info]

Science dictionaries Science (2 matching dictionaries)
  1. penicillin: On-Line Biology Book: GLOSSARY [home, info]
  2. penicillin: Evolution Glossary [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. penicillin: Urban Dictionary [home, info]

(Note: See penicillins for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (penicillin)

noun:  any of various antibiotics obtained from penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases

▸ Also see penicillins
Word origin

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Phrases that include penicillin:   penicillin resistant bacteria, penicillin g benzathine, penicillin g potassium, penicillin induced hemolytic anemia, penicillin binding proteins, more...

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