AltaVista Translations
Will translate -- loosely -- from English to French, German, Italian, Portugese or Spanish, or in the reverse. Works on a small block of text or a Web page.

ArtLex Art Dictionary
3,300+ terms and their definitions, from the world of art and aesthetics, plus images and cross-references -- each definition that has another term in it links to that other term, so you could spend all day going from one to another. There are longer articles on some of the more important subjects, from Expressionism to illumination to the Hudson River School.

Business Dictionaries (OneLook)
Investment, advertising, eduation, real estate, etc.

CMU Pronouncing Dictionaries (OneLook)
116,000 terms pronounced.

Computer/Internet Dictionaries (OneLook)
Web jargon, computer terms.

Dictionary of Phrase and Fable (1894)
Thousands of literay allusions and everyday language fun.

Dictionary: PC Hardware/Data Communications Terms
Provides complete descriptions of complex terms in personal computing and networks. From print version (no longer available) published by O'Reilly & Associates. Search by keyword or concept.

DOD Dictionary of Military Terms
Pentagon speak explained.

Encyclopedia of the New Economy
From HotWired, definitions for disintermediation, Moore's Law, transparency and other terms of the information economy.

Financial Encyclopaedia
An amazingly detailed financial dictionary.

General Dictionaries (OneLook)
Children, BritSpeak, homonyms, etc.

Glossary of Internet Terms
Another good glossary about the Net. From Internet Literacy Consultants.

Glossary of Newspaper Terms
From the Newspaper Association of America.

Guide to Economic Terms (FACS)
From "absolute advantage" to "working poor."

High-Tech Dictionary
What is a magneto-optical disk? Here's a searchable computer dictionary, also with browsable lists of HTML tags, emoticons, file types, and Internet domain suffixes. From ComputerUser.com.

Information Please Almanac
An online dictionary, almanac and encycolpedia. Includes today in history.

Jane's Defence Glossary
More than 20,0000 defense-related (oops, defence-related) terms and acronyms.

Language Identifier
If you're wondering what language your words are in, this'll tell you.

Legal dictionaries
What the heck is collateral estopal?

Lexicool.com
Lexicool.com is one of the most comprehensive directory of bilingual and multilingual dictionaries on the Internet. The site has a fully searchable database, with over a thousand titles referenced.

List of Dictionaries
A comprehensive list of dictionaries in many languages.

Management and Technology Dictionary
You don't need an M.B.A. to sound like one.

Medical Dictionaries (OneLook)
Oncology, diabetes, alzheimer's, HIV, drugs, etc.

Medword's medical links
A large list of links, collected for medical transcriptionists, including medical dictionaries, drug companies, etc.

Movie Terminology Glossary
Did you know that grips work closely with gaffers?

My Virtual Reference Desk
A huge list of dictionaries of all types.

NetLingo
A glossary of hundreds of Internet terms.

News Watch style guide
A word watching guide for terms about racial and ethnic minorities. From the Center for Integration and Improvement of Journalism of the San Francisco State University Journalism Department.

OneLook Dictionaries
Searches more than 200 dictionaries at once. Also try the following:

Other Subject Dictionaries (OneLook)
Art, literature, genealogy, music, politics, name etymology, etc.

Oxford English Dictionary
The greatest dictionary in any language is now on the Web, but at a price: $550 for an individual subscription, $750 for an institution. But the word of the day is free. And institutions can sign up for a 30-day free trial. Each entry gives a thorough history of the word's meanings.

Phrase Finder
Start with a word, find a common phrase.

Public Record Finder
Links to more than 6,000 free public record sites around the world. Search by keyword, or by category such as criminal and sex offenders, business or court records. Also find reference sites such as dictionaries and people finders or data sites on labor and transportation.

Religion Dictionaries (OneLook)
Bible, Judaism, Islam, Scientology.

Research It
A one-stop shop for dictionaries, translators, other Web tools.

Roget's Thesaurus
Comprehensive search of the 1991 version. From the ARTFL Project and the University of Chicago.

Science Dictionaries (OneLook)
From Aquatic terms to Math to Weather.

Semantic Rhyming Dictionary
Find perfect rhymes, or match the last sound only, or homophones, etc.

Sententiae Latinae
Latin maxims translated to English, usually with sources cited. Collected by Johanna Sundberg of Sweden.

Shark Talk: Everybody's Law Dictionary
Basic terms of everyday law.

Slang Dictionaries (OneLook)
British, Rap, etc.

Sports Dictionaries (OneLook)
Poker terms, Climbing, Croquet, Rugby, etc.

Standard Industrial Classifications Index
The SIC Codes are used by government and industry to classify industries. A new system will be more savvy with service industries.

Systran
Provides online translation among European languages. But you certainly wouldn't want to negotiate a contract based on its translation. I sent "assistant metro editor at the Chicago Sun-Times" through from English to French, and then sent the result back from French to English, and it became, "auxiliary editor of subway during Sun-Times of Chicago." And "broadcast intern" became "intern of emission." But it is free.

Tech Terms Computer Dictionary
The Tech Terms Computer Dictionary contains definitions of hundreds of computer terms explained in simple language, with real-world examples.

Technological Dictionaries (OneLook)
Culinary terms, space, gems, beer, whatever.

The Alternative Dictionaries
A "collaborative project" where Web users can add words that aren't usually included in dictionaries. Essentially unedited. Mostly vulgarities.

The Wordsmyth English Dictionary-Thesaurus
Search the only integrated dictionary and thesaurus on the Web.

TheFreeDictionary.com
Not only definitions, but links to other words with that word in the definition. (Is there a word for that?) And examples of use from classic literature.

WashingtonPost.com business glossary
1,300 financial terms defined.

Weather glossary
A popular, low-science, glossary. From Weather.com, which offers weather updates by e-mail, twice a day.

Webster's Revised Unabridged Dictionary
Search the 1913 edition of the unabrdidged tome.

Word Choice from American Heritage
Is it "compare with" or "compare to"? "Continual" or "continuous"? Here are the opinions of the American Heritage language panel.

Word2Word Language Resources
Links to a mind-boggling number of free dictionary, language-learning, and translating services for just about every language one could want. Plus games!

WordSmyth
"The Educational Dictionary-Thesaurus," with more than 50,000 words defined. Links to synonyms.

World Wide Web Acronym and Abbreviation Server
What does UCC stand for? This site, slow as it is, defines 15,000 acronyms.

WWWebster Dictionary
A fast version of Merriam Webster's Collegiate Dictionary.

WWWebster Thesaurus
A fast thesaurus, also from Merriam Webster.

Yahoo Dictionaries
A good current list of dictionaries.

Your dictionary
Dictionaries and translators online. A thorough list.

yourDictionary
Links to more than 1500 dictionaries from more than 200 languages. The main page allows lookup of English words in Merriam-Webster's Collegiate Dictionary. Especially strong on specialty dictionaries, such as business, computing, cooking, finance, genealogy, humor, law, medicine and sports.