English Dictionaries

Merriam-Webster Online Collegiate Dictionary- A free, searchable on-line dictionary and thesaurus, word games, a word of the day, and many other English language and vocabulary reference tools and resources.
Merriam-Webster Online Thesaurus - A free, searchable on-line American English thesaurus and dictionary directly from Mirriam Webster..
Collins Cobuild Student' Dictionary: a nice dictionary with many pictures
Cambridge International Dictionary of English
Cambridge Dictionary of American English
Cambridge International Dictionary of English Idioms
Cambridge International Dictionary of English Phasal Verbs
Webster Revised Unabridged Dictionary Dictionary, Year 1913 Edition: 109,562 entries
Roget's Thesaurus, 1911 edition.
Newbury House Dictionary of American English: 40,000 entries linked to a 50,000 photo database
Wordsmyth Educational Integrated Dictionary-Thesaurus: online American English dictionary with an integrated thesaurus. It contains 50,000 headwords, and very precisely defined and hyperlinked synonyms.
Dictionary of Alternative Meanings/International Sland in Different Languages
Hutchinson Dictionary of Difficult Words': over 13,900 difficult words. Increase your vocabulary or just find out what those words really mean!
CMU Pronouncing Dictionary
Columbia Encyclopedia Online, 6th ed. 2000 The Columbia Encyclopedia, the most up-to-date encyclopedia available, contains over 50,000 article entries, 40,000 bibliographic citations and over 80,000 cross-reference entries.
American Heritage? Online Dictionary of the English Language, 3rd ed. 1996 The unabridged American Heritage? Dictionary contains over 200,000 entries.
Roget?s II: New Thesaurus Online, 1995 edition. Roget?s II contains 35,000 synonyms, in an easy-to-use format as well as numerous cross-references and succinct word definitions?a classic for every reference shelf.
AllWords Dictionary Search
Simpson?s Contemporary Quotations Online provides over 10,000 quotes from over 4000 sources, including 25 categories of quotes, and 60 sections, ranging from ?love? to ?criminology.?
The American Heritage? Book of English Usage
Dictionary of American Sign Language
HandSpeak: A Dictionary of Sign Language
Australian Dictionary designed for the American reader
English to American Dictionary
Oxford English Dictionary by subscription only ($550/year)
Biographical Dictionary
Rhyming Dictionary: English
Free Online Dictionary of Computing