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We found 56 dictionaries with English definitions that include the word rat:
Click on the first link on a line below to go directly to a page where "rat" is defined.

General (39 matching dictionaries)

1. rat: Merriam-Webster.com [home, info]
2. rat: Oxford Dictionaries [home, info]
3. rat: American Heritage Dictionary of the English Language [home, info]
4. rat: Collins English Dictionary [home, info]
5. rat: Vocabulary.com [home, info]
6. rat, rat: Macmillan Dictionary [home, info]
7. Rat, rat, rat: Wordnik [home, info]
8. rat: Cambridge Advanced Learner's Dictionary [home, info]
9. RAT, Rat, 'rat, rat: Wiktionary [home, info]
10. rat: Webster's New World College Dictionary, 4th Ed. [home, info]
11. rat: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. rat: Infoplease Dictionary [home, info]
13. RAT: Dictionary.com [home, info]
14. rat: Online Etymology Dictionary [home, info]
15. rat: UltraLingua English Dictionary [home, info]
16. rat: Cambridge Dictionary of American English [home, info]
17. rat: Cambridge International Dictionary of Idioms [home, info]
18. RAT, Rat (disambiguation), Rat (film), Rat (newspaper), Rat (short story), Rat (zodiac), Rat, The Rat (Beavis and Butt-Head), The Rat (novel), The Rat (play), The Rat (song), The Rat: Wikipedia, the Free Encyclopedia [home, info]
19. rat: Cambridge International Dictionary of Phrasal Verbs [home, info]
20. Rat: Online Plain Text English Dictionary [home, info]
21. rat: Webster's Revised Unabridged, 1913 Edition [home, info]
22. rat: Rhymezone [home, info]
23. Rat (m), rat, rat (de), rat (m): AllWords.com Multi-Lingual Dictionary [home, info]
24. rat: Webster's 1828 Dictionary [home, info]
25. RAT: Dictionary of Americanisms (1848) [home, info]
26. RAT: Stammtisch Beau Fleuve Acronyms [home, info]
27. Rat, Rat, Rat: Dictionary of Phrase and Fable (1898) [home, info]
28. rat: Double-Tongued Word Wrester [home, info]
29. Rat: Encarta® Online Encyclopedia, North American Edition [home, info]
30. Rat: 1911 edition of the Encyclopedia Britannica [home, info]
31. rat: Free Dictionary [home, info]
32. rat: Mnemonic Dictionary [home, info]
33. rat: WordNet 1.7 Vocabulary Helper [home, info]
34. rat: LookWAYup Translating Dictionary/Thesaurus [home, info]
35. rat: Dictionary/thesaurus [home, info]
36. rat: Wikimedia Commons US English Pronunciations [home, info]
37. rat(e): AllWords.com Multi-Lingual Dictionary [home, info]

Business (1 matching dictionary)

38. R.A.T: Glossary of Trade and Shipping Terms [home, info]

Computing (5 matching dictionaries)

39. RAT: Netlingo [home, info]
40. RAT: Webopedia [home, info]
41. RAT: Hacking Lexicon [home, info]
42. RAT: SMS Dictionary [home, info]
43. rat: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

44. rat: online medical dictionary [home, info]
45. rat: Medical dictionary [home, info]

Miscellaneous (5 matching dictionaries)

46. rat, rat, rat: Terminology and Descriptions of Geneaological Words [home, info]
47. RAT: Acronym Finder [home, info]
48. RAT: Three Letter Words with definitions [home, info]
49. RAT: AbbreviationZ [home, info]
50. rat: Idioms [home, info]

Slang (4 matching dictionaries)

51. Rat: Totally Unofficial Rap [home, info]
52. rat: ESL Slang page [home, info]
53. R.A.T, The Rat: Urban Dictionary [home, info]
54. Rat: Twists, Slugs and Roscoes: Hardboiled Slang [home, info]

(Note: See ratting for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (rat) ▸ noun:  any of various long-tailed rodents similar to but larger than a mouse ▸ noun:  a pad (usually made of hair) worn as part of a woman's coiffure ▸ noun:  one who reveals confidential information in return for money ▸ noun:  a person who is deemed to be despicable or contemptible ("Kill the rat") ▸ noun:  someone who works (or provides workers) during a strike ▸ verb:  employ scabs or strike breakers in ▸ verb:  desert one's party or group of friends, for example, for one's personal advantage ▸ verb:  catch rats, especially with dogs ▸ verb:  give (hair) the appearance of being fuller by using a rat ▸ verb:  take the place of work of someone on strike ▸ verb:  give away information about somebody ▸ Also see ratting ▸ Word origin ▸ Words similar to rat ▸ Usage examples for rat ▸ Popular adjectives describing rat ▸ Words that often appear near rat ▸ Rhymes of rat ▸ Invented words related to rat