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Merriam-Webster: http://www.m-w.com/dictionary.htm

The American Heritage Dictionary (4th Edition): 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.

Zargan: http://www.zargan.com.tr With a (free) subscription to the site you may use the translation options of Turkish-English and English-Turkish.

Roget’s Thesaurus: http://dictionary.reference.com/ In addition to the dictionary meaning of words, the site also has Thesaurus and Encyclopedia sections.