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American Sign Language Dictionary
Includes video clips demonstrating how to sign each word.
BiologyBrowser.org
Click on "For Students" to access a Biology Dictionary and Thesaurus, and a Glossary for Taxonomy.
Credo Reference 
Online dictionaries on almost every topic: Technology, Computing, Medical Terms, Probation and Offenders, Youth Justice, Cultural Studies, Law, Literature, Business, Language, Geography, Human Geography, Food and Beverage, Business, Art, Politics, Psychology, Religion, and Music, as well as Bilingual Dictionaries in French, German, Spanish, Italian, Portuguese, Polish, and more.
Dictionary of Contemporary Slang
Guide to the use of slang in conversation, including drugs, sport and contemporary society, as well as slang topics related to sexual culture and bodily functions. Found in Credo Reference.
Free Online Dictionary of Computing
Definitions of acronyms related to computer jargon, programming languages, tools, architecture, operating systems, networking, theory, conventions, standards, mathematics, telecoms, electronics, institutions, companies, projects, products, and computer history.
Glossarist.com
A directory of glossaries and topic-specific dictionaries.
iTools.com
Dictionary and Thesaurus that also pronounces words.
Merriam-Webster Online
Dictionary, Thesaurus, Spanish-English translator, and Medical Dictionary. Includes audio clips of pronunciation.
Merriam-Webster Visual Dictionary Online
An easy to use dictionary with illustrated words. Definitions are provided in up to six languages.
Thesaurus.com
A comprehensive online thesaurus.
Visual Thesaurus
An interactive dictionary and thesaurus that creates word maps, word meanings, and related words.
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