##Etymology
- 有 Etymology 的词典 http://pdawiki.com/forum/thread-11545-1-1.html
- Kleins Comprehensive Etymological Dictionary of the English Language
- The Oxford Dictionary of English Etymology
- Concise Oxford Dictionary of English Etymology
- The Barnhart Dictionary of Etymology
- Chambers Dictionary of Etymology
- Origins: A Short Etymological Dictionary of Modern English
- An Analytic Dictionary of English Etymology: An Introduction http://pdawiki.com/forum/thread-21291-1-1.html
## Phrasal Verbs / Idioms / ...
- Oxford Phrasal Verbs Dictionary
- 牛津短语动词词典(英汉双解版)
- Oxford Idioms Dictionary for Learners of English
- 牛津英语习语词典(英汉双解版)
- 朗文袖珍英汉双解短语动词词典
- Longman Dictionary of English Roots
- 朗文常用英文词根词典(英英·英汉双解)
- Longman Dictionary of Common Errors
- The American Heritage Dictionary of Idioms
- McGraw-Hill's Dictionary of American Idioms and Phrasal Verbs
- Longman Idioms Dictionary
- Longman American Idioms Dictionary
- Longman Pocket Idioms Dictionary
- Longman Dictionary of Phrasal Verbs
- Cambridge Idioms Dictionary
- Cambridge Dictionary of American Idioms
- Cambridge Phrasal Verbs Dictionary
- Bloomsbury Dictionary of Idioms
- Allen's Dictionary of English Phrases
##
- The American Heritage Student Dictionary
- The American Heritage Children's Dictionary
- The American Heritage Student Grammar Dictionary
- Amerian Heritage Dictionary of Science
- † The Facts On File Student’s Dictionary of American English http://www.pdawiki.com/forum/thread-19655-1-1.html
- A Frequency Dictionary of Contemporary American English
- The Routledge Dictionary of Modern American Slang and Unconventional English
## Rhyming
- Merriam-Webster's Rhyming Dictionary
- New Oxford Rhyming Dictionary
- The Penguin Rhyming Dictionary
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## Encyclopedia
- Encyclopædia Britannica
- World Book Encyclopedia
- Encyclopedia Americana
- † Collier's Encyclopedia :: Encarta
- Columbia Encyclopedia
- † Chambers's Encyclopedia