Merriam-Webster's WordCentral.Com - Offers a student dictionary, Daily Buzzword, and interactive word games. Includes homework help and lesson plans for parents and teachers.
Wordsmyth - A dictionary and thesaurus in one. Also gives parts of speech and examples for more than 50,000 words.
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.
The American Heritage Dictionary of the English Language - Provides definitions for 350,000 words.
Biographical Dictionary - Learn more about any of 28,000 notable men and women who have shaped the world from ancient times to the present day. The dictionary can be searched by names, keywords, and dates.
Semantic Rhyming Dictionary - Use this tool to find rhyming words.
Webopedia - Definitions of many computer-related terms, from hardware to the internet.
Dictionary Online: Web Directory - Comprehensive collection free online dictionaries, thesauri, and glossaries organized by subject, language, and interest.
The 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.
DinoDictionary.com - Features profiles of over 300 known dinosaurs along with audio files that demonstrate how to pronounce their names.
ArtLex - Dictionary of visual art defines more than 3,000 art-related terms. Also includes a comprehensive collection of artwork and famous quotes.
Fact Monster - An online dictionary with definitions and information about the history of over 125,000 words.
PSEUDOdictionary - Defines everyday words including slang, webspeak, and colloquialisms.
Free On-line Dictionary of Computing - A searchable dictionary of terms from computing and related fields.
The Internet Picture Dictionary - Free, online multilingual picture dictionary with interactive activities for English, French, German, Spanish, Italian and ESL learners.
Dictionary.com - Online English dictionary, thesaurus and reference guide. Includes word games, online translator, and word of the day feature.
Realdictionary.com - Features search to locate words by initial letters and numbers.