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We found 34 dictionaries with English definitions that include the word rule of thumb:
Click on the first link on a line below to go directly to a page where "rule of thumb" is defined.

General (25 matching dictionaries)

1. rule of_thumb: Merriam-Webster.com [home, info]
2. rule of_thumb: Oxford Learner's Dictionaries [home, info]
3. rule of_thumb: American Heritage Dictionary of the English Language [home, info]
4. rule-of-thumb, rule-of-thumb, rule of_thumb: Collins English Dictionary [home, info]
5. rule of_thumb: Vocabulary.com [home, info]
6. rule of_thumb: Wordnik [home, info]
7. rule of_thumb: Cambridge Advanced Learner's Dictionary [home, info]
8. rule-of-thumb, rule of_thumb: Wiktionary [home, info]
9. rule of_thumb: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. rule of_thumb: Infoplease Dictionary [home, info]
11. rule of_thumb: Dictionary.com [home, info]
12. Rule-of-thumb, Rule of thumb: Wikipedia, the Free Encyclopedia [home, info]
13. rule of_thumb: Rhymezone [home, info]
14. Rule of Thumb: Dictionary of Phrase and Fable (1898) [home, info]
15. rule of_thumb: Free Dictionary [home, info]
16. rule of_thumb: Mnemonic Dictionary [home, info]
17. rule of_thumb: WordNet 1.7 Vocabulary Helper [home, info]
18. rule of_thumb: LookWAYup Translating Dictionary/Thesaurus [home, info]
19. Rule of Thumb: The Word Detective [home, info]
20. RULE OF THUMB: Ye Olde English Sayings [home, info]
21. rule of_thumb: Dictionary/thesaurus [home, info]
22. Rule of thumb: World Wide Words [home, info]
23. Rule of thumb: Phrase Finder [home, info]

Business (4 matching dictionaries)

24. RULE OF THUMB: Accounting Glossary [home, info]
25. Rule-of-Thumb: Construction Term Glossary [home, info]
26. Rule of thumb: Accounting, Business Studies and Economics Dictionary [home, info]
27. rule of_thumb: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

28. rule of_thumb: Encyclopedia [home, info]

Miscellaneous (2 matching dictionaries)

29. rule of_thumb: Political [home, info]
30. rule of_thumb: Idioms [home, info]

Slang (1 matching dictionary)

31. rule of_thumb: Urban Dictionary [home, info]

Tech (1 matching dictionary)

32. rule-of-thumb: Glossary of Meteorology [home, info]

(Note: See rule_of_thumbs for more definitions.)

Quick definitions from WordNet (rule of thumb) ▸ noun:  a rule or principle that provides guidance to appropriate behavior ▸ Also see rule_of_thumbs ▸ Words similar to rule of thumb ▸ Usage examples for rule of thumb ▸ Idioms related to rule of thumb (New!) ▸ Words that often appear near rule of thumb ▸ Rhymes of rule of thumb ▸ Invented words related to rule of thumb