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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 (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 (2 matching dictionaries)

27. harmful: Glossary of Legal Terms [home, info]
28. harmful: Legal dictionary [home, info]

Science (1 matching dictionary)

29. Harmful: HYPP Zoology [home, info]

Tech (1 matching dictionary)

30. Harmful: AUTOMOTIVE TERMS [home, info]

(Note: See harmfulness for more definitions.)

Quick definitions from Macmillan ( ) Provided by 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 ▸ Words similar to harmful ▸ Usage examples for harmful ▸ Popular nouns described by harmful ▸ Words that often appear near harmful ▸ Rhymes of harmful ▸ Invented words related to harmful