Dictionaries & Thesauri

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General Dictionaries & Other References
OneLook Dictionaries Dictionary.com Merriam-Webster Online InfoPlease.com Visual Dictionary Online
Specialty Dictionaries
Mathwords Math Progress Glossary Visual Mathematics Dictionary Concise Oxford Dictionary of Mathematics Free On-Line Dictionary of Computing
Webopedia - Online Tech Dictionary NetLingo Hardware Terms
Thesauri
Thesaurus.com Thinkmap Visual Thesaurus Wordsmyth Dictionary-Thesaurus Getty Vocabularies Connecting Mathematics Thesaurus