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Visuword
Explore the lexicon. Whether you are a native English speaker or a second language user-either as a student or a teacher-browse the language in ways you couldn't with traditional printed reference materials.
http://visuwords.com
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Visual Dictionary Online
Explore the 15 major themes to access more than 6,000 images and see words like never before.
http://www.visualdictionaryonline.com
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OneLook Reverse Dictionary
OneLook's reverse dictionary lets you describe a concept and get back a list of words and phrases related to that concept.
http://www.onelook.com/reverse-dictionary.shtml
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Rhyme Zone Rhyming Dictionary and Thesaurus
Includes the functions of a rhyming dictionary, thesaurus, and spelling checker, as well as an integrated full-text search engine for all of Shakespeare's works and thousands of quotations and poems.
http://www.rhymezone.com
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Phonetics Spelling Dictionary
A phonetic spelling dictionary is something that anyone can make to aid them in learning how to pronounce the words they want to use.
http://grammar.yourdictionary.com/lesson-plans/Phonetics-Spelling-Dictionary.html
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Oxford Advanced Learner's Dictionary
Oxford Advanced Learner's Dictionary - the largest and most trusted free online dictionary for learners of English. Quickly find clear definitions and audio pronunciations of words.
http://www.oxfordlearnersdictionaries.com/us/definition/english
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Cambridge Learner's Dictionary: Meanings & Definitions
The most popular dictionary and thesaurus. Meanings & definitions of words in Learner English with examples, synonyms, pronunciations and translations.
http://dictionary.cambridge.org/dictionary/learner-english/
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Encyclopedic dictionary - Define Encyclopedic dictionary at Dictionary
Encyclopedic dictionary definition at Dictionary, a free online dictionary with pronunciation, synonyms and translation. Look it up now!
http://www.dictionary.com/browse/encyclopedic-dictionary
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What is an Electronic Dictionary? - Wise Geek
An electronic dictionary is a digital reference book containing words and their meanings, spellings, and etymologies.
http://www.wisegeek.com/what-is-an-electronic-dictionary.htm
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Bilingual Dictionary - Wikipedia, the free encyclopedia
A bilingual dictionary or translation dictionary is a specialized dictionary used to translate words or phrases from one language to another.
https://en.wikipedia.org/wiki/Bilingual_dictionary