by subject

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• - Getty's terms, as used in several AAT indexes.
  
• - National Institutes of Health thesaurus. Provides resource for medical, social, and demographic terms related to alcohol and drug use.
  
• - Extensive listings for chemistry. Produced by Chemical Abstracts Service, a division of the American Chemical Society.
  
• - You can search for a name from its meanings. The site has more than 10,000 names with meanings.
  
• - National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms.
  
• - A comprehensive list of LOC Classification schedules.
  
• - Hierarchical and alphabetical interface to library-related terms.
  
• - Definitions of common mathematical terms, along with broader, narrower, and related concepts.
  
• - Astronomical terms. Searches may be performed in English, French, German, Italian, and Spanish.
  
• - European Union terminology. Available on most European Union languages.
  
• - Links to multiple LOC thesauri, including GLIN, the Global Legal Information Network.
  
• - Structured vocabulary of place names.
  
• - A British business education thesaurus with an intriguing navigational component from the London Business School.
  
• - Over a thousand instruments, with relational links based on the Library of Congress Subject Headings.