National Aeronautics and Space Administration Thesaurus. Includes coverage of scientific terms.

http://www.sti.nasa.gov/nasa-thesaurus.html

Reference Thesauri By_Subject

You can search for a name from its meanings. The site has more than 10,000 names with meanings.

http://www.yourbabysname.com/thesaurus.htm

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Links to multiple LOC thesauri, including GLIN, the Global Legal Information Network.

http://www.loc.gov/lexico/servlet/lexico

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A list of LOC Classification schedules.

http://www.loc.gov/catdir/cpso/lcco/lcco.html

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Management education thesaurus from the London Business School organizes terms into a solar system of related ideas.

http://conceptspace.london.edu/

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Over a thousand instruments, with relational links based on the Library of Congress Subject Headings.

http://alteriseculo.com/instruments/

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Structured vocabulary of place names.

http://www.getty.edu/research/conducting_research/vocabularies/tgn/

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National Institutes of Health thesaurus. Provides resource for medical, social, and demographic terms related to alcohol and drug use.

http://etoh.niaaa.nih.gov/AODVol1/Aodthome.htm

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Astronomical terms. Searches may be performed in English, French, German, Italian, and Spanish.

http://www.mso.anu.edu.au/library/thesaurus/

Reference Thesauri By_Subject

Glossary of carbon dioxide and climate terms.

http://cdiac.esd.ornl.gov/glossary.html

Reference Dictionaries By_Subject Science Environmental