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WordCentral.com 
[ Kids/Teens ] - Merriam-Webster's site for kids has a student dictionary, Daily Buzzword, and interactive word games. Includes homework help and lesson plans for teachers.
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Alcwin.org [ Mature Teens ] - Site listing several types of dictionaries related to the sciences.
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The American Heritage Dictionary of the English Language [ Kids/Teens/Mature Teens ] - Contains over 90,000 entries, including 70,000 audio word pronunciations.
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ArtLex [ Teens/Mature Teens ] - Dictionary of visual art defines more than 3,500 art-related terms. Also includes a comprehensive collection of artwork and famous quotes.
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Biographical Dictionary [ Kids/Teens/Mature Teens ] - Read about more than 28,000 notable men and women from history. Search by names, dates, professions, achievements, and more.
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DinoDictionary.com [ Kids/Teens/Mature Teens ] - Features profiles of over 300 known dinosaurs along with pronunciations of their names.
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eLook Dictionary [ Kids/Teens ] - Provides definitions, synonyms, and related words.
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Fact Monster [ Teens/Mature Teens ] - An online dictionary with definitions of more than 125,000 words and links to other related student tools.
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Free On-line Dictionary of Computing [ Kids/Teens/Mature Teens ] - A searchable dictionary of terms from computing and related fields.
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Giraffian Children's Picture Dictionary [ Kids ] - A collection of illustrated words and concepts, aimed at children in preschool or early primary years.
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Ice Phoenix Vocab Project [ Teens/Mature Teens ] - Downloadable program that looks up entire lists of vocabulary words.
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InfoVisual [ Kids/Teens/Mature Teens ] - Thematic visual dictionary that focuses on learning through images. Concise definitions within the fields of vegetal biology, animal biology, human anatomy, and transportation.
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The Internet Picture Dictionary [ Kids/Teens/Mature Teens ] - Free, online multilingual picture dictionary with interactive activities for English, French, German, Spanish, Italian and ESL learners.
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Little Explorers [ Kids ] - Picture dictionary gives definitions, pictures, and Internet links for over 2,350 entries. Includes translations for English to and from Dutch, French, Spanish, and more.
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NetLingo Dictionary [ Teens/Mature Teens ] - Provides a glossary of Internet jargon and acronyms.
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OneLook Dictionary Search [ Kids/Teens/Mature Teens ] - Type in a word and search many dictionaries at once. Also has a reverse dictionary and translations.
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Pidic.com [ Teens/Mature Teens ] - An online picture dictionary with thousands of images
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PSEUDOdictionary [ Mature Teens ] - Defines everyday words including slang, webspeak, and colloquialisms.
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RhymeZone [ Kids/Teens/Mature Teens ] - Online rhyming dictionary. Search for a word and get a list of potential words that rhyme in addition to a definition.
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The Skeptic's Dictionary [ Teens/Mature Teens ] - Definitions and essays on occult, paranormal, and supernatural ideas and practices from the point of view of someone who is a sceptic, that is, does not believe in these things.
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Tech Terms Computer Dictionary [ Mature Teens ] - A searchable dictionary of computer terms with definitions explained in simple language.
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Terminology Collection: Online Dictionaries [ Teens/Mature Teens ] - Glossaries for several languages and for specialized fields from the University of Vaasa, Finland.
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WebDictionary.co.uk [ Teens/Mature Teens ] - Online dictionary and reference website.
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Webopedia [ Teens/Mature Teens ] - Definitions of many computer-related terms, from hardware to the internet.
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wordIQ [ Teens/Mature Teens ] - Search on several different dictionaries, an encyclopedia, and the web.
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