An Internet Dictionary.
   Online dictionary lets you search for definitions, cross-references English dictionaries based on multiple databases. Cross-references English dictionaries based on multiple databases. Downloadable software gives the ability to integrate the dictionary wi
   http://Dict.AIEdu.com

AnsMe.com Dictionary
   Finds definitions, similar-sounding words, relations, words that rhyme, and translations.
   http://dictionary.ansme.com/

AskOxford.com
   For questions on English grammar, spelling, and usage; to search a dictionary of words, names or quotations; for help with writing; for crosswords and puzzles.
   http://www.askoxford.com/

Bibliomania: Webster's Unabridged Dictionary of 1913
   Forms version. Allows browsing headwords.
   http://www.bibliomania.com/2/3/257/frameset.html

DataSegment.com: Online Dictionary
   Find definitions by alphabetical browsing or word lookup. Powered by several print dictionaries.
   http://onlinedictionary.datasegment.com/

Dictionary.com
   Online English dictionary, thesaurus and reference guide. Includes word games, online translator, and word of the day feature.
   http://dictionary.reference.com/

Die.net Online Dictionary
   Cross-referenced definitions, spelling correction, and searches from WordNet, Webster's, and a variety of specialized sources. Supports regular expressions and the DICT protocol.
   http://dict.die.net/

Freesearch Dictionary
   A British English dictionary powered by the Cambridge University Press that contains around 150,000 words. The site offers a search feature or can be browsed by letter.
   http://www.freesearch.co.uk/dictionary

HyperDic
   Based on the WordNet lexical database and thesaurus, this dictionary covers only a selection of the most frequent English words. Includes synonyms, antonyms, examples and pronunciation, and links between related words.
   http://www.hyperdic.net/

Macmillan English Dictionaries
   Resource site for the Macmillan range of dictionaries.
   http://www.macmillandictionaries.com/

SmartDictionary.com
   Supports both searching and browsing and encourages user contributions.
   http://www.smartdictionary.com/

The American Heritage Dictionary of the English Language
   Online publication of the 4th edition. Featuring audio word pronunciations, illustrations.
   http://www.bartleby.com/61/

The Beet Foundation
   General purpose online English language dictionary and Thesaurus.
   http://beetfoundation.com/words/

The English-to-American Dictionary
   A humo(u)rous resource for Americans learning British/Scottish English.
   http://english2american.com/

The Rap Dictionary
   Hip-hop slang and also contains a list of hip-hop artists and their real names.
   http://www.rapdict.org/terms/a

The Wordsworth Compendium
   Program containing over 516,000 English words and phrases to solve word puzzles. Useful for the search and manipulation of words in all aspects of logological activities.
   http://dictionary-thesaurus.com/

Ultralingua Online Dictionary
   Searchable dictionary of the English language, with standard, reverse and phonetic lookup. Also links to a range of other language resources.
   http://www.ultralingua.net/

dictionary.net
   Comprehensive dictionary database of word and phrase definitions from 8 different sources.
   http://www.dictionary.net/