NASA Thesaurus National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms.
CAS General Subject Vocabulary Helper Extensive listings for chemistry. Produced by Chemical Abstracts Service, a division of the American Chemical Society.
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.
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.
Eurodic Autom European Union terminology. Available on most European Union languages.
