Dictionaries & Thesauri

• American Heritage Dictionary of the English Language (4th ed.)
  http://www.bartleby.com/61/
  From Bartleby.com. Includes color illustrations and audio pronunciation.
  
  
• Brewer's Dictionary of Phrase and Fable
  http://www.bartleby.com/81/
  Brewer's Dictionary of Phrase and Fable comprises over 18,000 entries that reveal the etymologies, trace the origins and otherwise catalog words "with a tale to tell." Includes people, literary characters, names, places, creatures, objects, terminology, and events from folklore, folk life, legends, and mythology.
  
  
• Merriam-Webster Dictionary
  http://www.m-w.com/
  Includes thesaurus and dictionary with audio pronunciation.
  
  
• Roget's Thesauri
  http://www.bartleby.com/thesauri/
  From: Bartleby.com. Roget's II: The New Thesaurus, Third Edition. 1995 & Roget's International Thesaurus of English Words and Phrases (1922)
  
  
• Your Dictionary.com
  http://www.yourdictionary.com/
  Access to 1,800 dictionaries in 230 languages. Includes thesauri, grammars, specialty dictionaries, and translators.