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  • nalorphine
    An early antagonist of most depressant and stimulatory effects of morphine and related narcotic analgesics; precipitates severe withdrawal symptoms in morphine addicts, and counteracts the respiratory depression produced by morphine and related compounds; when administered in the absence of narcotics, nalorphine has mildly analgesic and respiratory depressant effects in nonaddicts; superseded by naloxone hydrochoride.

    Alternate names: N-allylnormorphine

  • naloxone hydrochloride
    A synthetic congener of oxymorphone, a potent antagonist of both endorphins and narcotics. Used to treat opiate overdose to reverse coma and respiratory depression; included in formulations of pentazocine to reduce the risk of abuse.
  • naltrexone
    An orally active narcotic antagonist; devoid of pharmacologic action when administered in the absence of narcotics.
  • NAME syndrome
    the concurrence of nevi, atrial myxoma, myxoid neurofibromas, and ephilides.
  • Named reporting

    Named reporting: In public health, named reporting is the reporting of infected persons by name to public health departments. This is standard practice for the surveillance of many infectious diseases such as syphilis, gonorrhea, and tuberculosis that pose a public health threat. The opposite of named reporting is anonymous testing in which the individual remains nameless.

  • names
    nomatophobia, onomatophobia.
  • nanaerobe
    Organism capable of growth in nanomolar concentrations of oxygen as well as in anaerobic environments.
  • NANBNC hepatitis
    abbreviation for non-A, non-B, non-C hepatitis.
  • NANC neuron
  • NANDA
    Acronym for North American Nursing Diagnosis Association.
  • Nanism

    Nanism: Once known as dwarfism, this condition is now correctly called short stature.

  • Nannizzia
    A genus of ascomycetous fungi composed of Microsporum species in their perfect state.
  • nano-
    Combining form relating to dwarfism (nanism). Prefix used in the SI and metric systems to signify submultiples of one billionth (10−9).
  • nanogram
    One billionth of a gram (10−9 g).
  • nanoid enamel
    a condition of abnormal thinness of the enamel.

    Alternate names: dwarfed enamel

  • nanokatal
    One billionth of a katal (10−9 kat).
  • nanomedicine
    That branch of medicine reliant on nanotechnology in any form.
  • nanometer
    One billionth of a meter (10−9 m).
  • Nanophyetus salmincola
    A digenetic fish-borne fluke (family Nanophyetidae) of dogs and other fish-eating mammals; the vector of Neorickettsia helmintheca, the agent of salmon poisoning.

    Alternate names: Troglotrema salmincola

  • nanukayami fever
    a form of leptospirosis seen in Japan; caused by a leptospira normally found in the field mouse or vole.

    Alternate names: nanukayami

  • nape nevus
    a pale vascular birthmark found on the nape of the neck in 25–50% of normal persons.
  • napex
    The area of the scalp just below the occipital protuberance.
  • naphthalene
    A carcinogenic and toxic hydrocarbon obtained from coal tar; used for many syntheses in industry and in some moth repellents; naphthalene can cause an attack of hemolytic anemia in people with a deficiency of glucose-6-phosphate dehydrogenase.

    Alternate names: naphthalin, tar camphor

  • naphthazoline hydrochloride
  • naphthol
    A hydroxynaphthalene, occurring in two forms: α-naphthol, a dye intermediate used in cytochemistry for l-arginine localization; and β-naphthol, also known as isonaphthol, used as an anthelmintic and antiseptic. Both forms are also used in the manufacture of dyes, organic chemicals, and rubber products.

    Alternate names: naphthalenol

  • naphthol yellow S
    An acid dye used as a stain for basic proteins in microspectrophotometry.
  • naphtholate
    A compound of naphthol in which the hydrogen in the hydroxyl radical is substituted by a base.
  • naphthoquinone
    A quinone derivative of naphthalene, reducible to naphthohydroquinone; 1,4-naphthoquinone derivatives have vitamin K activity (menaquinone). A class of compounds containing the naphthoquinone (1) structure.
  • naphthyl
  • naphthyridine 2-pyridones
    antimicrobial agents; DNA gyrase inhibitors with structural similarities to fluoroquinolones.
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