Maths Thesaurus - Definitions of common mathematical terms, along with broader, narrower, and related concepts.
Babynames Thesaurus - You can search for a name from its meanings. The site has more than 10,000 names with meanings.
Library of Congress Thesauri - Links to multiple LOC thesauri, including GLIN, the Global Legal Information Network.
Library of Congress Classification Schedules - A comprehensive list of LOC Classification schedules.
Alcohol and Other Drug Thesaurus - AOD - National Institutes of Health thesaurus. Provides resource for medical, social, and demographic terms related to alcohol and drug use.
Concept Space - Management education thesaurus from the London Business School organizes terms into a solar system of related ideas.
The Astronomy Thesaurus - Astronomical terms. Searches may be performed in English, French, German, Italian, and Spanish.
Thesaurus of Musical Instruments - Over a thousand instruments, with relational links based on the Library of Congress Subject Headings.
Getty Thesaurus of Geographic Names - Structured vocabulary of place names.
Inter Active Terminology for Europe (IATE) - European Union terminology. Available on most European Union languages.
Art and Architecture Thesaurus - Getty's terms, as used in several AAT indexes.
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