Language Dictionaries   Arts Dictionaries  IT & Computers Dictionaries 
Financial Dictionaries  Law Dictionaries  Medical Dictionaries  Music Dictionaries 
Science Dictionaries  Sexuality Dictionaries  Wordplay Dictionaries  All Other Dictionaries

Arts Dictionaries

1. ArtLex  - dictionary of art terminology, especially for art students elementary through undergraduate.
2. Dictionary of Philosophy of Mind  - dictionary for those terms commonly used, defined, contested, and misunderstood in the philosophy of mind. Submissions welcome.
3. Art Movements and Periods - brief descriptions of major art movements.
4. Grove Dictionary of Art Online - subscription service including the complete, fully searchable text with images.
5. Textile Dictionary - definitions of cotton, silk, specialty, and plant fibers.
6. Words of Art: An On-line Glossary of Theory and Criticism for the Visual Arts

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IT & Computers Dictionaries

1. Babylonia - English-German dictionary of computing terms.
2. CNET Glossary - do all your Net-savvy friends laugh at you every time you open your mouth? Netify your vocabulary here.
3. Comparative CyberLexicon - a compilation of English terminology peculiar to computer culture and technology and its equivalents in Spanish.
4. Computer Words - defines common terms and concepts for non-technical people.
5. ComputerUser High Tech Dictionary - searchable glossary of computer and Internet words, acronyms, and abbreviations.
6. Diccionario de Términos Informáticos - dictionary of computer terms from English to Spanish.
7. Dictionary of PC Hardware and Data Comm. Terms - includes the ability to search online or to order the actual book.
8. Dictionary of Storage Networking Terminology - comprehensive attempt by the members of the Storage Networking Industry Association to arrive at a common body of terminology for the technologies it represents.
9. Digital Media Knowledge Base - includes definitions, illustrations, standards, and tutorials.
10. Free On-line Dictionary of Computing (FOLDOC) - simply enter a computing-related term in the search box and hit enter.
11. Glossary-Tech.com - acronyms and abbreviations used in the computer industry. Download the complete list in one single file.
12. Internet and Unix Dictionary
13. Jargon Scout - an irregular feature that aims to give advance warning of jargon that is just about ready to hatch into the Net's language.
14. Jones Encyclopedia of Media & Technology Information - features articles on a variety of topics on the history, innovations, milestones, pioneers, and legal trends that shape the world of media, information technology, telecommunications, and broadband.
15. Ken's Dictionary of Computer Standards - attempt to codify defacto and unwritten computer industry standards.
16. Quick Guide to Register Jargon - humorous rough guide to jargon used by the biting British source of information technology and computer news and insight. From the Beast of Redmond to stinkpad.
17. TechDictionary - computer and technology terms, acronyms, chat abbreviations, filename extensions, and emoticons.
18. TechEncyclopedia - definitions of computer and technology terms and concepts.
19. Technical Glossary
20. TECHtionary - offers an on-line animated dictionary of technical terms and words.
21. TekMom's Technology Buzzwords for Students
22. U-Geek Glossary Search
23. Webopedia - resource for information about PCs. Includes links to web pages related to each term.
24. WhatIS.com - cross-referenced Internet glossary with links to related sites. A word-oriented view of the Web.

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Financial Dictionaries

1. InvestorWords  - searchable financial glossary with terms listed by subject as well. Offers partnering options.
2. American Banker Online: Banker's Glossary - provides definitions and explanations of common terms for banking professionals.
3. American Business Jargon Dictionary - dictionary of American business jargon from above board to zilch, zip, and zombie bonds.
4. Australian Financial Review Dictionary of Investment Terms
5. Business Glossary - courtesy of washingtonpost.com.
6. Finance-Glossary.com - cross-referenced, keyword searchable terms with links to related streaming video, events, and web sites.
7. Financial Glossary - long list of over 2,500 financial terms compiled by Campbell R. Harvey at Duke University.
8. MoneyWords - glossary for business, financing, and real estate.
9. Offshore Glossary
10. Quicken.com Glossary
11. TermFinance - explanations of financial terms in English, French, German, and Italian.

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Law Dictionaries

1. Dictionary of Law (1893) - dictionary and compendium of American and English jurisprudence, first published in 1893.
2. Duhaime's Law Dictionary - volunteer project from the World Wide Legal information Association.
3. FindLaw: Dictionary - searchable database of legal terms.
4. International Law Dictionary and Directory - offers definitions of international legal terms along with descriptions and links to international organizations.
5. Jurisdictionary - useful facts about the words and the rules that lawyers use.
6. law.com: Law Dictionary - searchable database of legal terms.
7. Nolo.com: Everybody's Law Dictionary - contains plain-English definitions for legal terms.

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Medical Dictionaries

1. Archaic Medical Terms - a glossary that defines archaic terminology for medical conditions, symptoms, and diseases originally created to help genealogy researchers.
2. InteliHealth: Merriam-Webster Medical Dictionary - search for definitions for specific diseases, drugs, anatomical parts, and more.
3. Medical Dictionary Online - provides a searchable dictionary and glossary of medical terminology definitions, pharmaceutical drugs, medical devices, health conditions, specialty terms, and abbreviations.
4. Medical/Surgical Word Glossary - FDA approved drugs, devices, surgical/medical instruments, and procedures.
5. MedTerms.com Medical Dictionary - alphabetical list of terms and definitions.
6. Multilingual Glossary of Technical and Popular Medical Terms in Nine European Languages - provides medical terms in English, French, Spanish, Portuguese, Italian, Dutch, Greek, Danish, and German.
7. On-Line Medical Dictionary - OMD is a searchable dictionary of terms relating to biochemistry, biology, chemistry, medicine, molecular biology, physics, plant biology, radiobiology, and zoology.
8. Who Named It? - dictionary of medical eponyms with the stories of diseases, conditions, medical syndromes, and the people whose names they carry.

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Music Dictionaries

1. All Music Guide (AMG) - encyclopedic database of music. Includes artist biographies, album reviews, and fully cross-referenced discographies that allow the user to browse from artist to artist.
2. Austin Symphony: Online Music Dictionary - a glossary of popular music terms.
3. Blues Language - offers a dictionary of words and phrases.
4. Classical Music Dictionary - provides sound files and information on composers.
5. Dictionary of Music Terms - a list of music terms and their definitions provided by the music department of Contra Costa College in California.
6. English-to-French Music Dictionary - offers translations of musical terminology.
7. Music For The Mind - music dictionary.
8. Musical Heritage Network Instrument Encyclopedia - search for the instrument of your choice or browse through the collection by the Sachs-Hornbostel classification scheme or by geographical origin.
9. New Grove Dictionary of Music & Musicians 2nd edition, The - offers subscription service to the complete text, plus a free trial.
10. New Grove Dictionary of Opera, The - offers subscription service to the full text, plus a free trial.

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Science Dictionaries

1. A+ Materials Science and Engineering Glossary of Terms
2. Algorithms, Data Structures, and Problems - terms and definitions of algorithms, data structures, and classical problems in sorting, searching, combinatorics, graphs, and more.
3. Amateur Telescope Makers Dictionary - words in nine languages: English, French, German, Dutch, Portuguese, Spanish, Indonesian, Italian, and Russian. Definitions in English.
4. BioTech's Biotechnology Dictionary - free, searchable online dictionary of biology, chemistry, and biotechnology terms.
5. Chemistry & Environmental Dictionary - provides definitions for technical terms and acronyms, and related articles.
6. Dictionary of Cell and Molecular Biology - provides quick access to easily-understood and cross-referenced definitions.
7. Dictionary of Units, A - an explanation of the principle systems of units, their history, standards, and conversion factors for changing from one to the other.
8. GIS Dictionary - includes definitions for terms which either relate directly to GIS or which GIS users may come across in the course of their work.
9. Glossary of Botanical Terms - interactive glossary of terms relating to botany, gardening, horticulture and landscape architecture.
10. Glossary of Satellite Terms
11. Glossary of Space Terms - from the NASA Jet Propulsion Laboratory.
12. How Many? - dictionary of units of measurement with commentaries and explanations of the English Customary, Metric, and International Systems.
13. Hypertext Glossary of Genetic Terms - searchable database of genetic terms with hypertext cross references and pictures.
14. Lexicon EncycloBio - provides biological terms, definitions with pictures, and Flash movies. Includes an internal search engine.
15. Mathematical Programming Glossary - glossary of terms (plus supplements) used in optimization.
16. Science Terms: Distinctions, Restrictions, and Confusions - discussion of familiar words that have specific or specialized meanings in science, and scientific terms that are easy to confuse. From The American Heritage Book of English Usage.
17. University of Alberta Cognitive Science Dictionary
18. Visionary - a dictionary for the study of human and animal vision, including terms from biological and machine vision, visual psychophysics, visual neuroscience, and other related fields.
19. Visual Dictionary of Special Plane Curves - including description, history, formulas, properties, and links for each.
20. Water Words Dictionary - from the Nevada Division of Water Planning.
21. Web Directory: Dictionaries and Unit Conversion for Engineers
22. Wind Energy Conversion Systems Glossary

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Sexuality Dictionaries

1. Dictionary of Bizarre Sexual Practices
2. Obscure Sexual Terms - dictionary of some lesser-known and more unusual practices.
3. Sex Glossary - offers definitions of sexual terminology.
4. Sexicon for Lovers and Others - contains sex terms, definitions, synonyms, and quotations.

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Wordplay Dictionaries

1. AmeriSpeak - dictionary of expressions of our American ancestors and phrases that have been passed down through the generations.
2. BuzzWhack - buzzword-compliant dictionary provides definitions for business buzzwords, slang, and jargon.
3. Dictionary of Management Jargon - definitions of common words and terms used by management when speaking to employees.
4. Foolish Dictionary, The - offers reference to uncertain English words and their origins and meanings.
5. Online Liff Dictionary - gives words to objects and experiences that demand to be named, but never have been.
6. Sniglets - words that don't appear in the dictionary, but should.
7. Unwords.com - collection of sniglets, made-up words and definitions created by everyday people, out of necessity or for humor.
8. Verbalist a.k.a. Confessions of a Logophile - list of useful, interesting, and esoteric words and etymologies.
9. Word Pirates - a glossary of pirated words used often by marketers, politicians and other short-sighted, sticky-fingered people.
10. Word Spy, The - dictionary of recently coined words, old words used in new ways, and existing popular words and phrases.

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All Other Dictionaries

1. Merriam-Webster Dictionary  - official site for the reference publisher. Includes online versions of the collegiate dictionary and thesaurus.
2. OneLook Dictionaries  - search for multiple definitions of a word from a variety of online dictionaries.
3. allwords.com - English dictionary with multi-lingual search capability. Includes crossword solver features.
4. American Heritage Dictionary of the English Language, Fourth Edition - features over 90,000 entries, most with audio word pronunciations.
5. AskOxford.com   - contains a dictionary and thesaurus, as well as quotations, word of the day, games, and lexicography.
6. Cambridge International Dictionaries - search separate dictionaries of English, phrasal verbs, or idioms.
7. Century Dictionary Online - American dictionary with fulltext search page images representing the definitions, atlas, and cyclopedia from the original text.
8. CoolDictionary.Com: Audible Webster Dictionary - features audio clips of words and quotes.
9. DICT Development Group  - simultaneously search several dictionaries for word definitions including Websters, Jargon File, and other databases.
10. Dictionary of American Regional English - specializes in regional words and phrases.
11. Dictionary.com - features a variety of tools including thesauri, translator, and writing resources.
12. Encarta World English Dictionary - features audio clips of words pronounced.
13. FreeDictionary.org - simultaneously and efficiently searches several dictionaries for word definitions.
14. Google Glossary - find definitions, phrases, and acronyms.
15. HyperDictionary - displays definitions with each individual word in the definition hyperlinked to its definition.
16. Hypertext Webster Gateway - offers point-and-click interface for accessing various dictionary services on the Internet.
17. iTools Language Tools - features dictionary, thesaurus, and translation tools.
18. LookWAYup - dictionary and search tool embedded into the web page.
19. VoyCabulary - makes the words on any webpage into links so you can look them up in a dictionary or other reference site, by simply clicking on the words.
20. WebRef.org - providing glossaries of terms related to various scientific disciplines, aesthetic arts, and biographical information.
21. Word Assault - searches various dictionaries for multiple words at a time.
22. WordNet - online dictionary that finds words that mean the same, are more general, or more specific.
23. Wordsmyth Educational Dictionary-Thesaurus - American English dictionary with an integrated thesaurus and other lexical resources.
24. Yahoo! Reference - provides dictionary, encyclopedia, quotation, and world fact resources.
25. From Language to Language  - multilingual translation dictionary.
26. Dictionary of English Phonesthemes - phonesthemes, or sound-symbols, play an important role in word-formation and psycholinguistics.
27. English-Kurdish Dictionary - provides translations of words.
28. Eurodicautom - European Commission's multilingual term bank, with a focus on technical and specialized terminology.
29. Internet Picture Dictionary - multilingual picture dictionary with interactive activities for learning English, French, German, Spanish, and Italian.
30. Mingo Egads - texts, grammar, dictionary, and learning resources for this Iroquoian language.
31. Terminological Information System (TIS) - online version of the database used by terminologists and translators working in the General Secretariat of the Council of the European Union.
32. Travlang's Translating Dictionaries - multilingual online dictionaries including German, French, Spanish, English, Dutch, Danish, Afrikaans, Esperanto, Frisian, and more.
33. Ukrainian Online Dictionaries
34. WordReference.com - enables website visitors to double-click any English word for a definition or translation.
35. WordSniffer - multi-lingual dictionary for English, German, French, Spanish, Italian, Japanese, Chinese, and more. Offers definitions, pronunciations, and sample sentences.
36. Symbols.com  - information on more than 2,500 western signs and ideograms.
37. American Business Jargon Dictionary - dictionary of American business jargon from above board to zilch, zip, and zombie bonds.
38. Biographical Dictionary - covers notable men and women who have shaped the world from ancient times to the present day.
39. Biography Center - multi-lingual biographical directory.
40. Bushido Online - encyclopedia exploring the history and philosophy of Bushido. Includes its relation to Kung Fu, Karate, and Kobudo.
41. Dictionary of Mountain Bike Slang - expressions for the trail-savvy.
42. Dictionary of Occupational Titles (DOT) Index - alphabetical index to the revised fourth edition, 1991.
43. Dictionary of Phrase and Fable - giving the derivation, source, or origin of common phrases, allusions, and words that have a tale to tell.
44. DOD Dictionary of Military and Associated Terms
45. Glossary of Social Science Computer and Social Science Data Terms - includes terms which may be useful in managing data collections and providing basic data services.
46. Illustrated Dictionary of Jewelry - includes jewel terms, mineralogy, jewelry manufacturers, jewelry styles, gemstone cuts, etc.
47. Jane's Internet Defence Glossary - thousands of defence related acronyms and abbreviations.
48. Movie Terminology Glossary - definitions of terms and phrases frequently used in the world of movies, film, acting, and cinemagoing.
49. Nonverbal Dictionary, The - gestures, signs, and body language cues, from adam's-apple-jump to zygomatic smile.
50. ODLIS: Online Dictionary of Library and Information Science
51. Online Film Dictionary - reference for movie terms in foreign languages.
52. Pimbley's Dictionary of Heraldry
53. Poker Dictionary - lexicographic exploration of the popular card game.
54. Poker Glossary - terms and definitions for basic poker play.
55. Political Dictionary - non-partisan dictionary covering contemporary politics.
56. Samuel Adams Beer Dictionary - from ale to zymurgy, the science of brewing.
57. Space & Electronic Warfare Lexicon - collection of technical terms, acronyms, mission areas, taxonomies, and citations relating primarily to Naval electronic warfare and space warfare.
58. Alternative Dictionaries - collaborative international slang dictionary.
59. Alternative Dictionaries, The - collaborative Internet project collating slang from languages around the world.
60. Alternative Turkish Dictionary - express yourself brusquely with the aid of this abbreviated Turkish-English slang dictionary.
61. American Cultural Knowledge for Confused New Zealanders - includes NZ words and their U.S. "translations".
62. Australian Slang - learn these words and phrases and you'll feel at home on your first day Down Under.
63. Boston Slanguage
64. BuzzWhack - buzzword-compliant dictionary provides definitions for business buzzwords, slang, and jargon.
65. College Slang Page: Da Bomb - the 411 on the hip talk in the hallowed halls.
66. Dictionary of American Regional English - specializes in regional words and phrases.
67. Dictionary of Mountain Bike Slang - expressions for the trail-savvy.
68. Dictionary of Slang - collection of slang currently used in Britain, including slang links, bibliography, and related articles.
69. English-to-American Dictionary - ever wondered how to snog? What sort of blokes pull birds? For Americans learning Scottish English.
70. Gay Slang Dictionary - collection of slang terms used in the gay community. Submit your own.
71. Jom Ngomong2x - comparisons of Indonesian and Malaysian slang.
72. Kiwi Words & Phrases - light-hearted look at words and expressions commonly used in New Zealand.
73. Limerick/Dublin Slang Dictionary. - dictionary of slang words from Limerick and their Dublin equivalent
74. London Slang - deals with slang usage in and around London.
75. New Words in English - neologisms and novel uses of words in English. The words give a good picture of the creative aspects of word formation and use in present day English.
76. New Zealand Expressions - list of expression and words commonly used in New Zealand followed by the U.S. equivalent definition.
77. Nonsensicon, The - non existent words and their meaning.
78. Online Dictionary of Playground Slang - indexed dictionary of colloquialisms and slang words (past and present) used throughout the English-speaking world.
79. Online Dictionary of Street Drug Slang - searchable dictionary with thousands of slang terms.
80. Online Slang Dictionary
81. Pseudo Dictionary  - compiling words that people may use all the time that aren't in a normal dictionary. Includes slang, webspeak, and colloquialisms. Submissions welcome.
82. Rap Dictionary - resource for hip-hop slang.
83. Scottish Slang Productions - collection of Scottish slang phrases recorded in and around London by true Scots. WAV and Real Audio files available.
84. Scullerypress - an online slang dictionary from the Inverclyde area.
85. Seattle Lexicon, A - rundown on some of the peculiarly local lingo.
86. SlangSite.com - dictionary of slang, webspeak, made up words, and colloquialisms.
87. Some Irish Slangwords
88. Surfing for Slang: Recommended Slang Links - links to English and Scandinavian slang-related sites.
89. Twists, Slugs and Roscoes: A Glossary of Hardboiled Slang - the language spoken by Philip Marlowe, Sam Spade, Mike Hammer. With the help of this glossary, you too can speak it like a native.
90. Urban Dictionary - define your world and submit words for others to see.
91. Ye Olde English Sayings - examining the origins of phrases often taken for granted.
92. FAQ - Naval Terminology, Jargon and Slang - derived from the royal navies of the former British Empire.