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| Alcohol and Other Drug Thesaurus - AOD - http://etoh.niaaa.nih.gov/AODVol1/Aodthome.htm National Institutes of Health thesaurus. Provides resource for medical, social, and demographic terms related to alcohol and drug use |
| American Society of Indexers - Thesauri Online - http://www.asindexing.org/site/thesonet.shtml Annotated directory |
| Art and Architecture Thesaurus - http://www.getty.edu/research/conducting_research/vocabularies/aat/ Gettys terms, as used in several AAT indexes |
| Babynames Thesaurus - http://www.yourbabysname.com/thesaurus.htm You can search for a name from its meanings. The site has more than 10,000 names with meanings |
| Concept Space - http://conceptspace.london.edu/ Management education thesaurus from the London Business School organizes terms into a solar system of related ideas |
| Germ - http://www.germ.cz/ Searchable WordNet and Rogets Thesaurus with meaning trees |
| Getty Thesaurus of Geographic Names - http://www.getty.edu/research/conducting_research/vocabularies/tgn/ Structured vocabulary of place names |
| HASSET - http://www.data-archive.ac.uk/search/hassetSearch.asp Provides direct term search followed by hierarchical and other types of browsing. Based on a UNESCO thesaurus |
| Historical Thesaurus of English - http://www2.arts.gla.ac.uk/SESLL/EngLang/thesaur/homepage.htm Contains the vocabulary of English from the earliest written records to the present, with known recorded dates of usage, taken from the Oxford English Dictionary |
| INGRID Library Thesaurus - http://ingrid.utlib.ee/thesaurus.html Allows direct term search with results hyperlinked to broader and narrower search terms. Available in English and Estonian |
| Inter Active Terminology for Europe (IATE) - http://iate.europa.eu/iatediff/ European Union terminology. Available on most European Union languages |
| Lexical Freenet - http://www.lexfn.com/ Search for relationships between words and concepts that might never have occurred to you before |
| Library of Congress Classification Schedules - http://www.loc.gov/catdir/cpso/lcco/lcco.html A list of LOC Classification schedules |
| Library of Congress Thesauri - http://www.loc.gov/lexico/servlet/lexico Links to multiple LOC thesauri, including GLIN, the Global Legal Information Network |
| Maths Thesaurus - http://thesaurus.maths.org/ Definitions of common mathematical terms, along with broader, narrower, and related concepts |
| NASA Thesaurus - http://www.sti.nasa.gov/nasa-thesaurus.html National Aeronautics and Space Administration Thesaurus. Includes coverage of scientific terms |
| Phrases Thesaurus - http://www.phrasefinder.co.uk A resource for writers. Enter a single word and it will return a list of phrases and sayings that are related to the word in some way. In English |
| Rogets II: The New Thesaurus - http://education.yahoo.com/reference/thesaurus/ 3rd edition. Contains over 260,000 synonyms and cross-references. Features succinct word definitions and hyperlinked category index |
| Rogets Thesaurus - As distributed by Project Gutenberg - http://asadz.com/thesaurus/ E-text of Rogets Thesaurus No. Two, which is derived from the version of Rogets Thesaurus published in 1911 |
| Sybrinas Phrase Thesaurus - http://www.sybrina.com A creative phrase tool for creative writers of any genre including college students, people just learning English, people wanting to improve their communication skills, artistic professionals and others |
