"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."
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"Giving the derivation, source, or origin of common phrases, allusions, and words that have a tale to tell. . .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.'"
Rhyming, Crossword, Scrabble, Thesaurus, Quotations & Clichés, Synonyms, Definitions can all be found here, along with links to dictionaries on other sites.
"Based on the Webster 10th Collegiate edition, with updates added annually. More than 160,000 entries. Each word is accompanied by definition, pronunciation, usage, grammatical function, and a brief etymology. A thesaurus can be queried for similar words, and misspellings return suggested spellings. Includes an extensive pronunciation guide and sound files for the pronunciation of many terms."
Thesaurus.com has search dictionary or thesaurus and links to translators, games, categories and writing resources.
"The Wordsmyth Education Dictionary-Thesaurus is the premier online American English dictionary with an integrated thesaurus. WEDT contains 50,000 headwords, and very precisely defined and hyperlinked synonyms."
Wiktionary is above all a multilingual dictionary.