Find terms, their definitions, and related terms,
using NLM's MeSH and UMLS Metathesaurus.
Medical Subject Headings (MeSH) is NLM's controlled vocabulary thesaurus.
MeSH terminology provides a consistent way to retrieve information
that may use different terminology for the same concepts.
NLM's Unified Medical Language System (UMLS) Metathesaurus contains information
about biomedical concepts and terms from many sources.