U.S. National Library of Medicine (NLM)


The world’s largest medical library, the U.S. National Library of Medicine (NLM) is part of the National Institutes of Health (NIH).

The NLM has as its mission to collect, organize, and make available biomedical science information to investigators, educators, and practitioners and carry out programs designed to strengthen medical library services in the United States. Its electronic data bases, including MEDLINE, are used extensively throughout the world.

The NLM is situated on the NIH campus in Bethesda, Maryland. The Library collects materials in all areas of biomedicine and health care, as well as works on biomedical aspects of technology, the humanities, and the physical, life, and social sciences. The NLM collections stand at 5.3 million items–books, journals, technical reports, manuscripts, microfilms, photographs and images. Housed within the Library are medical history collections of old and rare medical texts, manuscripts, and incunabula. NLM is an invaluable resource for all U.S. health science libraries and for medicine.

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  • U (uracil)

    A nucleotide base and one member of the A-U (adenine-uracil) base pair in RNA. The other base pair in RNA is G-C (guanine-cytosine). Uracil takes the place in RNA that thymine (T) occupies in DNA.

  • Usher syndrome

    The most common disease that diminishes both hearing and vision, a group of genetic disorders in which retinitis pigmentosa (an eye disease that causes vision to deteriorate over time) is combined with congenital deafness. The hearing loss in a patient with Usher syndrome occurs in both ears as a result of nerve deafness. Some patients […]

  • USP

    United States Pharmacopeia.

  • USPHS (United States Public Health Service)

    There currently are more than 6,100 officers on active duty. Officers are assigned to all of the PHS Agencies and to a number of agencies outside of PHS, including the Bureau of Prisons, U. S. Coast Guard, Environmental Protection Agency, Health Care Financing Administration, and the Commission on Mental Health of the District of Columbia.

  • ut dict.

    If a medicine is to be taken every so-many hours (from “quaque”, every and the “h” indicating the number of hours) q.h. = every hour q.2h. = every 2 hours q.3h. = every 3 hours q.4h. = every 4 hours t.i.d. = three times a day (from “ter in die”, 3 times a day)


Disclaimer: U.S. National Library of Medicine (NLM) definition / meaning should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. All content on this website is for informational purposes only.