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heading

 [hed´ing]
a word or term found at the beginning of all or part of a piece of printed material.
Medical Subject h's (MeSH) see MeSH.
MeSH h's subject headings.
subject h's the terms chosen from medical subject headings (MeSH) to index the references appearing in medline and other national library of medicine databases. Called also MeSH terms and MeSH headings.