Merriam-Webster provides a free online dictionary, thesaurus, audio pronunciations, Word of the Day, word games, and other English language resources.
Dictionary.com
http://dictionary.reference.com/
This is a free online English dictionary, thesaurus and reference guide, crossword puzzles and other word games, online translator and Word of the Day.
American Heritage Dictionary
http://www.bartleby.com/61/
Over 90,000 entries feature 10,000 new words and senses, 70,000 audio word pronunciations, 900 full-page color illustrations, language notes and word-root appendixes.
Yahoo! Directory Dictionaries > By Language
http://dir.yahoo.com/Reference/Dictionaries/Language/
Yahoo! Search Directory's listing of language dictionaries from Afrikaans to Yiddish.
RhymeZone
http://www.rhymezone.com/
A language arts reference tool and comprehensive search engine for words. Includes the functions of a rhyming dictionary, thesaurus, and spelling checker, as well as an integrated full-text search engine for all of Shakespeare's works and thousands of quotations and poems."
On-Line Medical Dictionary
http://cancerweb.ncl.ac.uk/omd/
OMD is a searchable dictionary created by Dr. Graham Dark and contains terms relating to biochemistry, cell biology, chemistry, medicine, molecular biology, physics, plant biology, radiobiology, science and technology. It includes: acronyms, jargon, theory, conventions, standards, institutions, projects, eponyms, history, in fact anything to do with medicine or science.
MedTerms Medical Dictionary
http://www.medterms.com/script/main/hp.asp
MedTerms online medical dictionary is the medical reference for MedicineNet.com, containing easy-to-understand explanations of over 10,000 medical terms. This online medical dictionary provides quick access to hard-to-spell medical definitions through an extensive alphabetical listing.
ArtLex Art Dictionary
http://www.artlex.com/
You'll find definitions for more than 3,500 terms used in discussing visual culture, along with thousands of supporting images, pronunciation notes, great quotations and cross-references.
SYMBOLS.com
http://www.symbols.com/
SYMBOLS.com contains more than 2,500 Western signs, arranged into 54 groups according to their graphic characteristics. In 1,600 articles their histories, uses, and meanings are thoroughly discussed. The signs range from ideograms carved in mammoth teeth by Cro-Magnon men, to hobo signs and subway graffiti.
Webopedia
http://www.pcwebopedia.com/
An online computer dictionary and internet search engine for computer and Internet technology definitions.
Dictionary of Algorithms and Data Structures
http://www.nist.gov/dads/
This is a dictionary of algorithms, algorithmic techniques, data structures, archetypical problems, and related definitions. Algorithms include common functions, such as Ackermann's function. Problems include traveling salesman and Byzantine generals. Some entries have links to implementations and more information.
Biographical Dictionary
http://www.s9.com/biography/
This dictionary covers more than 28,000 notable men and women who have shaped our world from ancient times to the present day. The dictionary can be searched by birth years, death years, positions held, professions, literary and artistic works, achievements, and other keywords.
Merriam-Webster Online
http://www.m-w.com/thesaurus.htm
Merriam-Webster provides a free online dictionary, thesaurus, audio pronunciations, Word of the Day, word games, and other English language resources.
Roget's II: The New Thesaurus, Third Edition
http://www.bartleby.com/62/
Containing 35,000 synonyms in an easy-to-use format, this thesaurus features succinct word definitions and an innovative hyperlinked category index by the Editors of the American Heritage� Dictionary.
Roget’s International Thesaurus of English Words and Phrases
http://www.bartleby.com/110/
Mawson’s modernization of the classic structure becomes even more user-friendly on Bartleby.com with 85,000 hyperlinked cross-references. Additionally, over 2,200 quotations from classic and modern authors illustrate the 1,000-plus entries.
CIA - The World Factbook
http://www.odci.gov/cia/publications/factbook/index.htm
The first classified Factbook was published in August 1962, and the first unclassified version was published in June 1971. The NIS program was terminated in 1973 except for the Factbook, map, and gazetteer components. The 1975 Factbook was the first to be made available to the public with sales through the US Government Printing Office (GPO). The Factbook was first made available on the Internet in June 1997. The year 2003 marks the 56th anniversary of the establishment of the Central Intelligence Agency and the 60th year of continuous basic intelligence support to the US Government by The World Factbook and its two predecessor programs.
Columbia Encyclopedia
http://www.bartleby.com/65/
Containing nearly 51,000 entries (marshalling six and one-half million words on a vast range of topics), and with more than 80,000 hypertext cross-references, the current Sixth Edition is among the most complete and up-to-date encyclopedias ever produced.
Encyclopedia.com
http://www.encyclopedia.com/
Encyclopedia.com, the Internet's premiere free encyclopedia, provides users with more than 57,000 frequently updated articles from the Columbia Encyclopedia, Sixth Edition. Each article is enhanced with links to newspaper and magazine articles as well as pictures and maps - all provided by eLibrary.
Wikipedia
http://en.wikipedia.org/wiki/Main_Page
Wikipedia is a free content wiki encyclopedia being written collaboratively by contributors from around the world. As of May 2004, there are 261003 articles in English; every day hundreds of thousands of visitors from around the world make tens of thousands of edits and create thousands of new articles.
Google Scholar
http://scholar.google.com/
Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research. Use Google Scholar to find articles from a wide variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web.
MSN Encarta - Encyclopedia Article Center
http://encarta.msn.com/artcenter_0/Encyclopedia_Articles.html#tcsel
Search more than 4,500 articles on the world of knowledge--from aardvark to Zambia.
HighBeam Research
http://www.highbeam.com/library/index.asp?refid=elearners
Search this extensive archive of more than 32 million documents from 2,800 sources — a vast collection of articles from leading publications, updated daily and going back as far as 20 years. Save your searches, save articles and set up alerts to save time and increase your efficiency. HighBeam Research offers both basic (free) and full membership options.
Questia
http://www.questia.com/
Questia is the first online library that provides 24/7 access to the world's largest online collection of books and journal articles in the humanities and social sciences, plus magazine and newspaper articles. You can search each and every word of all of the books and journal articles in the collection. You can read every title cover to cover. Questia requires a monthly, quarterly or yearly subscription.
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