Acronym Server - (Formally Internet Acronym Server)
English Language Dictionaries
Little Explorer's Picture Dictionary - Picture dictionary targeting kids. This site offers services in multiple languages, including Spanish and German!
American Sign Language Dictionary - Contains ASL terms to help those trying to communicate with a person who signs but does not hear.
Logos - Especially great for students, this online dictionary offers conjugations and resources for children and adults.
Travelang's Translating Dictionaries - More than a dictionary, this site has information about travel, customs and even a currency
Everyone's Legal Glossary - Plain-English definitions to legal terms.
Medline Medical Dictionary - Dictionary of medical terms.
Rhyming Dictionary - For when you are trying to compose that perfect rhyming couplet.
Urban Dictionary - Free online dictionary of current slang. CAUTION!!!!! This site contains some material that may inappropriate for younger users
Free Online Dictionary of Computing - A computing dictionary that includes acronyms, jargon, programming languages, tools, standards, operating systems and histories.
NetLingo - Online dictionary of internet terms, acronyms and text-messaging speak