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We found 32 dictionaries with English definitions that include the word harmful:
Click on the first link on a line below to go directly to a page where "harmful" is defined.

General dictionaries General (28 matching dictionaries)
  1. harmful: Merriam-Webster.com [home, info]
  2. harmful: Oxford Dictionaries [home, info]
  3. harmful: American Heritage Dictionary of the English Language [home, info]
  4. harmful: Collins English Dictionary [home, info]
  5. harmful: Vocabulary.com [home, info]
  6. harmful: Macmillan Dictionary [home, info]
  7. Harmful, harmful: Wordnik [home, info]
  8. harmful: Cambridge Advanced Learner's Dictionary [home, info]
  9. harmful: Wiktionary [home, info]
  10. harmful: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. harmful: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. harmful: Infoplease Dictionary [home, info]
  13. harmful: Dictionary.com [home, info]
  14. harmful: UltraLingua English Dictionary [home, info]
  15. harmful: Cambridge Dictionary of American English [home, info]
  16. Harmful: Wikipedia, the Free Encyclopedia [home, info]
  17. Harmful: Online Plain Text English Dictionary [home, info]
  18. harmful: Webster's Revised Unabridged, 1913 Edition [home, info]
  19. harmful: Rhymezone [home, info]
  20. harmful: AllWords.com Multi-Lingual Dictionary [home, info]
  21. harmful: Webster's 1828 Dictionary [home, info]
  22. harmful: Free Dictionary [home, info]
  23. harmful: Mnemonic Dictionary [home, info]
  24. harmful: WordNet 1.7 Vocabulary Helper [home, info]
  25. harmful: LookWAYup Translating Dictionary/Thesaurus [home, info]
  26. harmful: Dictionary/thesaurus [home, info]

Business dictionaries Business (2 matching dictionaries)
  1. harmful: Glossary of Legal Terms [home, info]
  2. harmful: Legal dictionary [home, info]

Science dictionaries Science (1 matching dictionary)
  1. Harmful: HYPP Zoology [home, info]

Tech dictionaries Tech (1 matching dictionary)
  1. Harmful: AUTOMOTIVE TERMS [home, info]

(Note: See harmfulness for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (harmful)

adjective:  able or likely to do harm
adjective:  causing or capable of causing harm ("Too much sun is harmful to the skin")
adjective:  injurious to physical or mental health
adjective:  constituting a disadvantage
adjective:  tending to cause great harm
adjective:  contrary to your interests or welfare

▸ Also see harmfulness

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Invented words related to harmful

Phrases that include harmful:   harmful action, harmful algal bloom, harmful algal blooms, harmful externality, harmful interference more...

Words similar to harmful:   adverse, disadvantageous, evil, harmfully, harmfulness, inauspicious, injurious, noxious, untoward, more...

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