Thesaurus

Thesaurus.com - The king of the online thesauri offers a free online search of Roget's Interactive Thesaurus, First Edition, from the Lexico Publishing Group. From this page you can also access Dictionary.com, language resources, tools, a translator, and assorted premium content.

ARTFL Project Roget's Thesaurus Search - Search the headwords or full text of Roget's Thesaurus, 1911, version 1.02 (supplemented: July 1991) released to the public domain by MICRA, Inc. and the Gutenberg Project, courtesy of the ARTFL Project, University of Chicago.

Merriam-Webster Online - Search the Merriam-Webster Dictionary or Thesaurus. It's less thorough than Roget's, but that might be just what you're looking for!

Roget's II: The New Thesaurus - Bartleby.com offers a searchable online version of Roget's II, Third Edition (1995), written by the editors of the American Heritage Dictionaries.

Lexical Freenet Connected Thesaurus - For those who are truly obsessed with finding exactly the right word, this program is a combination thesaurus, rhyming dictionary, pun generator, and concept navigator, allowing you to search for relationships between words, concepts, and people. Endless fun for word freaks.

Top Three Thesaurus Choices for Writers - From Anne Wayman, About.com's Guide for Freelance Writers, here's a list of three of the top general thesauri, with links to help you find the best price to purchase them online.

Merriam-Webster's Collegiate Dictionary & Thesaurus - Merriam-Webster's "Collegiate Dictionary and Collegiate Thesaurus" on CD-ROM, audio edition, for families, professionals, students, and educators. Available for Windows and Macintosh.

WordWeb - This unique thesaurus/spellchecker program for Windows is available in a cut-down free version or as WordWeb Pro, with word finding, anagram, editing and customization features.

The NASA Thesaurus - This site contains the authorized subject terms by which the documents in the NASA STI Databases are indexed and retrieved. If you don't know what that means, you probably won't be able to use it, and it's not cheap! There is also a browsable PDF document if you scroll down.

Plumbdesign's Visual Thesaurus - A "three-dimensional" thesaurus that you have to experience to understand. You can learn all about it here, but it's $39.95 to download it to your computer.

German Thesaurus - About's German Language Guide Hyde Flippo has put together a listing of some common German words and their synonyms. Look for links to other German Language resources here, as well.

Web Thesaurus Compendium Subject Listing - In case what you want isn't listed above, here's a listing of thesauri and other indexing languages sorted according to subjects. If you can't find what you want here, it probably hasn't been created yet. Not updated recently, so it may contain some dead links, but nothing else like it exists.

Latin Dictionaries, Thesauri and Lexica - About Ancient/Classic History Guide N.S. Gill offers suggested links for Greek and Latin language buffs, including two thesauri.

The Cook's Thesaurus - Here's a cooking encyclopedia, in reality, covering thousands of ingredients and kitchen tools, with pictures.

The Astronomy Thesaurus - A listing of terms related to astronomy, in five languages. Not updated since 1995, but still should be useful to astronomers and astronomy researchers.

Web Thesaurus Compendium - Everything you ever wanted to know about thesauri on all topics (there's more than one), from archeology to women, including links to various online thesauri, literature and resources, research groups, thesaurus-building tools, and more. Not for the casual reader.

Thesaurus Construction - This site run by Prof. Tim Craven of the University of Western Ontario, Canada, presents the basics of constructing an information retrieval thesaurus.

Software for Building and Editing Thesauri - From Willpower Information, here's software for the development and editing of information retrieval thesauri, used to standardise the terms used when indexing and searching for items in a database. Includes an introduction to the principles of thesaurus use.