The U.S. National Library of Medicine launched the Unified Medical Language System (UMLS) in 1984 to help computers understand biomedical meaning as well as retrieve and integrate information from various electronic sources such as patient records and biomedical literature. From the set up of parameters for vocabulary sources, to the release of the UMLS "Metathesaurus," this article takes a look at how a vocabulary database tackled the most significant barrier to the application of computers in medicine, the lack of standard language in medicine.
