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We found 38 dictionaries with English definitions that include the word nightmare:
Click on the first link on a line below to go directly to a page where "nightmare" is defined.

General (31 matching dictionaries)

1. nightmare: Merriam-Webster.com [home, info]
2. nightmare: Oxford Learner's Dictionaries [home, info]
3. nightmare: American Heritage Dictionary of the English Language [home, info]
4. nightmare: Collins English Dictionary [home, info]
5. nightmare: Vocabulary.com [home, info]
6. nightmare: Macmillan Dictionary [home, info]
7. Nightmare, nightmare: Wordnik [home, info]
8. nightmare: Cambridge Advanced Learner's Dictionary [home, info]
9. nightmare: Wiktionary [home, info]
10. nightmare: Webster's New World College Dictionary, 4th Ed. [home, info]
11. nightmare: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. nightmare: Infoplease Dictionary [home, info]
13. nightmare: Dictionary.com [home, info]
14. nightmare: UltraLingua English Dictionary [home, info]
15. nightmare: Cambridge Dictionary of American English [home, info]
16. nightmare: Cambridge International Dictionary of Idioms [home, info]
17. NightMare (scareware), Nightmare (Atmosfear series), Nightmare (Avenged Sevenfold album), Nightmare (Avenged Sevenfold song), Nightmare (Building Rome album), Nightmare (Dungeons & Dragons), Nightmare (French band), Nightmare (Halsey song), Nightmare (Japanese band), Nightmare (Marvel Comics), Nightmare (Nightmare album), Nightmare (Soulcalibur), Nightmare (The Outer Limits), Nightmare (Tuesday Knight song), Nightmare (album), Nightmare (disambiguation), Nightmare (novel), Nightmare (single album), Nightmare (song), Nightmare, The Nightmare: Wikipedia, the Free Encyclopedia [home, info]
18. Nightmare: Online Plain Text English Dictionary [home, info]
19. nightmare: Webster's Revised Unabridged, 1913 Edition [home, info]
20. nightmare: Rhymezone [home, info]
21. nightmare: AllWords.com Multi-Lingual Dictionary [home, info]
22. Nightmare: Dictionary of Phrase and Fable (1898) [home, info]
23. nightmare: Free Dictionary [home, info]
24. nightmare: Mnemonic Dictionary [home, info]
25. nightmare: WordNet 1.7 Vocabulary Helper [home, info]
26. nightmare: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. Nightmare: The Word Detective [home, info]
28. nightmare: Dictionary/thesaurus [home, info]
29. nightmare: Online Etymology Dictionary [home, info]

Computing (1 matching dictionary)

30. nightmare: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

31. nightmare: online medical dictionary [home, info]
32. Nightmare: Sleep Terms [home, info]
33. nightmare: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

34. Nightmare: Brilliant Dream Dictionary [home, info]
35. nightmare: Idioms [home, info]

Slang (1 matching dictionary)

36. Nightmare: Urban Dictionary [home, info]

(Note: See nightmarishly for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (nightmare) ▸ noun:  a terrifying or deeply upsetting dream ▸ noun:  a situation resembling a terrifying dream ▸ Also see nightmarishly ▸ Word origin ▸ Words similar to nightmare ▸ Usage examples for nightmare ▸ Idioms related to nightmare (New!) ▸ Popular adjectives describing nightmare ▸ Words that often appear near nightmare ▸ Rhymes of nightmare ▸ Invented words related to nightmare