Medical Subject Headings
Medical Subject Headings (MeSH) is a comprehensive controlled vocabulary for the purpose of indexing journal articles and books in the life sciences; it can also serve as a thesaurus that facilitates searching. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed article database and by NLM's catalog of book holdings.
MeSH can be browsed and downloaded free of charge on the Internet through PubMed. Originally in English, MeSH has been translated into numerous other languages and allows retrieval of documents from different languages.