【オンライン辞書】
【国内】
●英和
EXCEED 英和辞典
http://dictionary.goo.ne.jp/ej/
●和英
EXCEED 和英辞典
http://dictionary.goo.ne.jp/je/
●国語
大辞林 第二版
http://dictionary.goo.ne.jp/jp/
●総合リンク集
辞書・辞典・用語大全
http://kyoto.cool.ne.jp/jiangbo/dictionary.htm
【海外】
●ESL/EFL辞典
Cambridge International Dictionary of English (CIDE)
Cambridge International Dictionary of Phrasal Verbs
Cambridge International Dictionary of Idioms
Cambridge International Dictionary of American English
http://www.cup.cam.ac.uk/elt/dictionary/
The Collins COBUILD Student's Dictionary
http://springbank.linguistics.ruhr-uni-bochum.de/ccsd/
Longman Web Dictionary
http://www.longman-elt.com/dictionaries/webdictionary.html
The Newbury House Online Dictionary
http://nhd.heinle.com/
Oxford Advanced Learner's Dictionary of Current English
〔検索画面が表示されないときは,左上の辞書の写真をクリック〕
http://www1.oup.co.uk/elt/oald/
●シノニム辞典
English Synonym Dictionary
http://dico.isc.cnrs.fr/dico/en/search
Historical Thesaurus of English
http://libra.englang.arts.gla.ac.uk/historicalthesaurus/synonym.html
MOT Collins Compact Thesaurus
http://kielikone.fi/default.aspx?intProductID=697
Synonym Dictionary
http://vancouver-webpages.com/synonyms.html
●百科事典系
HighBeam Encyclopedia
http://www.encyclopedia.com/
●その他
alphaDictionary.com〔1度に992の辞書を検索〕
http://www.alphadictionary.com/index.shtml
The Alternative English Dictionary〔sex関係に詳しい〕
http://www.notam.uio.no/~hcholm/altlang/
The American Heritage Dictionary of the English Language, Fourth Edition
http://www.bartleby.com/61/
Australiana
http://www.ozemail.com.au/~davesag/auzzie.html
Biotechnology Dictionary
http://biotech.chem.indiana.edu/pages/dictionary.html
BritSpeak
http://pages.prodigy.com/NY/NYC/britspk/main.html
The Dictionary of American Regional English
http://polyglot.lss.wisc.edu/dare/dare.html
Dictionary of Occupational Titles
http://www.wave.net/upg/immigration/dot_index.html
Hypertext Webster Interface
http://c.gp.cs.cmu.edu:5103/prog/webster
The Internet Language Dictionary
http://www.netlingo.com/
Kev's Down-Under Dictionary
http://wilson.com.au/diction.html
List of Dictionaries
http://math-www.uni-paderborn.de/HTML/Dictionaries.html
New Zealand English to U.S. English Dictionary
http://nz.com/NZ/Culture/NZDic.html
The Notable Citizens of Planet Earth Biographical Dictionary
http://www.tiac.net/users/parallax/
On-line Dictionaries
http://www.bucknell.edu/~rbeard/diction.html
On-line Dictionary of Street Drug Slang at Indiana University〔drug関係に詳しい〕
http://www.drugs.indiana.edu/slang/home.html
The Online Slang Dictionary: A Collaborative Project〔利用者の投稿で成り立つ〕
http://www.ocf.berkeley.edu/~wrader/slang/
Roget's Thesaurus
http://humanities.uchicago.edu/forms_unrest/ROGET.html
The Totally Unofficial Rap Dictionary
http://www.sci.kun.nl/thalia/rapdict/
URBAN dictionary.com〔頼りになる投稿式俗語辞典〕
http://www.urbandictionary.com/
WIKIPEDIA〔たいていのことはここで解決〕
http://www.wikipedia.com/wiki/
WWWebster Dictionary
http://www.m-w.com/dictionary
xrefer: The Web's reference Engine〔各種辞典を同時に検索〕
http://www.xrefer.com/
yourDictionary.com
http://www.yourdictionary.com/
Wikitionary
http://en.wiktionary.org/wiki/Wiktionary:Main_Page