NASA Thesaurus - National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms.The Astronomy Thesaurus - Astronomical terms. Searches may be performed in English, French, German, Italian, and Spanish.
OECD Macrothesaurus - Organization for Economic Co-operation and Development. Available in English, German, French, and Spanish. Thesaurus of sociological and economic issues pertaining to international development.
CAS General Subject Vocabulary Helper - Extensive listings for chemistry. Produced by Chemical Abstracts Service, a division of the American Chemical Society.
Eurodic Autom - European Union terminology. Available on most European Union languages.
Mathematical Thesaurus - Defines mathematical words and concepts, and indicates the links between them.
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 - Thesuaurs for the Global Legal Information Network, Legislative Index Vocabulary, Thesaurus for Graphic Materials, and the Thesaurus for Graphic Materials.
Art and Architecture Thesaurus - Getty's terms, as used in several AAT indexes.
Getty Thesaurus of Geographic Names - Structured vocabulary of place names.
National Monuments Record Thesauri - Cutural heritage data by English Heritage. Hierarchical and alphabetical listings of a variety of thesauri.
