Unified Medical Language System

The purpose of NLM's Unified Medical Language System (UMLS) is to facilitate the development of computer systems that behave as if they "understand" the meaning of the language of biomedicine and health. To that end, NLM produces and distributes the UMLS Knowledge Sources and associated software tools for use in building or enhancing electronic information systems that create, process, retrieve, integrate, and/or aggregate biomedical and health data and information, as well as in informatics research. The UMLS Knowledge Sources are multi-purpose and can be applied in systems that perform a range of functions involving one or more types of information, e.g., patient records, scientific literature, guidelines, public health data. The associated software tools assist developers in customizing or using the UMLS Knowledge Sources. There are three UMLS Knowledge Sources: the Metathesaurus, the Semantic Network, and the SPECIALIST lexicon. (NCI Thesaurus)

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