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We found 40 dictionaries with English definitions that include the word roar:
Click on the first link on a line below to go directly to a page where "roar" is defined.

General (32 matching dictionaries)

1. roar: Merriam-Webster.com [home, info]
2. ROAR, roar: Oxford Learner's Dictionaries [home, info]
3. roar: American Heritage Dictionary of the English Language [home, info]
4. roar: Collins English Dictionary [home, info]
5. roar: Vocabulary.com [home, info]
6. roar, roar: Macmillan Dictionary [home, info]
7. Roar, roar: Wordnik [home, info]
8. roar: Cambridge Advanced Learner's Dictionary [home, info]
9. roar: Wiktionary [home, info]
10. roar: Webster's New World College Dictionary, 4th Ed. [home, info]
11. roar: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. roar: Infoplease Dictionary [home, info]
13. Roar, roar: Dictionary.com [home, info]
14. roar (v.): Online Etymology Dictionary [home, info]
15. roar: UltraLingua English Dictionary [home, info]
16. roar: Cambridge Dictionary of American English [home, info]
17. ROAR, Roar (American TV series), Roar (British TV series), Roar (Katy Perry song), Roar (Monsters University song), Roar (Six Flags America), Roar (U.S. TV series), Roar (UK TV series), Roar (animal), Roar (film), Roar (given name), Roar (roller coaster), Roar (song), Roar (utterance), Roar (vocalization), Roar, The Roar (website), The Roar: Wikipedia, the Free Encyclopedia [home, info]
18. Roar: Online Plain Text English Dictionary [home, info]
19. roar: Webster's Revised Unabridged, 1913 Edition [home, info]
20. roar: Rhymezone [home, info]
21. roar: AllWords.com Multi-Lingual Dictionary [home, info]
22. roar: Webster's 1828 Dictionary [home, info]
23. ROAR: Stammtisch Beau Fleuve Acronyms [home, info]
24. roar: Free Dictionary [home, info]
25. roar: Mnemonic Dictionary [home, info]
26. roar: WordNet 1.7 Vocabulary Helper [home, info]
27. roar: LookWAYup Translating Dictionary/Thesaurus [home, info]
28. roar: Dictionary/thesaurus [home, info]
29. roar: Wikimedia Commons US English Pronunciations [home, info]
30. ROAR: Wikipedia, the Free Encyclopedia [home, info]

Business (1 matching dictionary)

31. roar: Legal dictionary [home, info]

Computing (1 matching dictionary)

32. Roar (roller coaster), roar: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

33. roar: online medical dictionary [home, info]
34. roar: Medical dictionary [home, info]

Miscellaneous (3 matching dictionaries)

35. ROAR: Acronym Finder [home, info]
36. ROAR: AbbreviationZ [home, info]
37. roar: Idioms [home, info]

Slang (1 matching dictionary)

38. R.O.A.R, roar: Urban Dictionary [home, info]

(Note: See roars for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (roar) ▸ noun:  the sound made by a lion ▸ noun:  a deep prolonged loud noise ▸ noun:  a very loud utterance (like the sound of an animal) ▸ verb:  laugh unrestrainedly and heartily ▸ verb:  make a loud noise, as of wind, water, or vehicles ("The water roared down the chute") ▸ verb:  act or proceed in a riotous, turbulent, or disorderly way ("Desperadoes from the hills regularly roared in to take over the town-R.A.Billington") ▸ verb:  utter words loudly and forcefully ("`Get out of here,' he roared") ▸ verb:  make a loud noise, as of animal ▸ verb:  emit long loud cries ▸ Also see roars ▸ Word origin ▸ Words similar to roar ▸ Usage examples for roar ▸ Idioms related to roar (New!) ▸ Popular adjectives describing roar ▸ Words that often appear near roar ▸ Rhymes of roar ▸ Invented words related to roar