Dictionary.com 
Free online English dictionary, thesaurus and reference guide, crossword puzzles and other word games, online translator and Word of the Day.
Domain: dictionary.com ArtLex - Art Dictionary
Dictionary of art terminology, especially for art students elementary through undergraduate.
Domain: artlex.com Semantic Rhyming Dictionary
Rhyming dictionary and thesaurus: rhymes, near rhymes, homophones synonyms, and semantic siblings of English words.
Domain: rhymezone.com Merriam-Webster's WordCentral.Com
Student dictionary and rhyming dictionary online at Merriam-Webster's website. Daily Buzzword by subscription.
Domain: wordcentral.com Little Explorers
Picture dictionary gives definitions, pictures, and Internet links for more than 1,100 words. Includes English and French, German, Portuguese, and Spanish to English dictionaries.
Domain: enchantedlearning.com Roget's International Thesaurus of English Words and Phrases
85,000 hyperlinked cross-references, plus proverbs and quotations from classic and modern authors.
Domain: bartleby.com Mathematical Thesaurus
Definitions of common mathematical terms, along with broader, narrower, and related concepts.
Domain: thesaurus.maths.org The Internet Picture Dictionary: Italian
Free, online multilingual picture dictionary with interactive activities for Italian, English, French, Spanish, German and ESL learners.
Domain: pdictionary.com PseudoDictionary
Compiling words that people may use all the time that aren't in a normal dictionary. Includes slang, webspeak, and colloquialisms. Submissions welcome.
Domain: pseudodictionary.com Merriam-Webster's Thesaurus
Searchable online thesaurus from Merriam-Webster.
Domain: merriam-webster.com The Internet Picture Dictionary
Multilingual picture dictionary with interactive activities for learning English, French, German, Spanish, and Italian.
Domain: pdictionary.com Fact Monster
An online dictionary with definitions and information about the history of over 125,000 words.
Domain: dictionary.factmonster.com Bartleby.com - American Heritage Dictionary
Online publication of The American Heritage Dictionary, Fourth Edition. Featuring 70,000 audio word pronunciations, 900 full-page illustrations and over 10,000 new words and senses.
Domain: bartleby.com Skeptic's Dictionary
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.
Domain: skepdic.com DinoDictionary.com
Features profiles of over 300 known dinosaurs along with audio files that demonstrate how to pronounce their names.
Domain: dinodictionary.com USM's Dictionary
Find thousands of dictionaries for any language or profession.
Domain: student-manual.com Bartleby.com - Roget's II - The New Thesaurus
Contains 35,000 synonyms, succinct word definitions and a hyperlinked category index.
Domain: bartleby.com Wordsmyth
American English dictionary with an integrated thesaurus and other lexical resources.
Domain: wordsmyth.net Webopedia
Searchable online dictionary and internet search engine for computer and internet terms and technical support. Definitions hyperlinked to further information.
Domain: webopedia.com Giraffian Kid's Picture Dictionary
Illustrated dictionary for preschool to early primary school aged children.
Domain: giraffian.com
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