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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «N»:

  1. Natriuresis Natriuresis
    Natriuresis: The excretion of an excessively large amount of sodium in the urine. Natriuresis is similar to diuresis (the excretion of an unusually large quantity of urine), except that in natriuresis the urine is exceptionally salty. Natriuresis occurs with some diuretics and diseases (as of the ad...
  2. Natriuretic Natriuretic
    Natriuretic: Causing natriuresis, the excretion of an excessively large amount of sodium in the urine. A hybrid of the Latin natrium = sodium and the Greek ouresis = a making water....
  3. Natriuretic peptide Natriuretic peptide
    Natriuretic peptide: One of the peptides that causes natriuresis, the excretion of an excessively large amount of sodium in the urine. The natriuretic peptides are produced by the heart and vasculature: A-type natriuretic peptide is secreted largely by the atrial myocardium in response to dilatati...
  4. Natural family planning Natural family planning
    Natural family planning: Also known as fertility awareness, periodic abstinence and the rhythm method, this approach entails not having sexual intercourse on the days of a woman's menstrual cycle when she could become pregnant or using a barrier method (such as a condom, the diaphragm or a cervical ...
  5. Natural immunity Natural immunity
    Natural immunity: Immunity that is naturally existing, Natural immunity does not require prior sensitization to an antigen. See: Innate immunity....
  6. Natural killer cell Natural killer cell
    Natural killer cell: A cell that can react against and destroy another cell without prior sensitization to it. Natural killer (NK) cells are part of our first line of defense against cancer cells and virus-infected cells. NK cells are small lymphocytes that originate in the bone marrow and develop ...
  7. Natural menopause Natural menopause
    Menopause, natural: Natural menopause occurs when the ovaries naturally decrease their production of the sex hormones estrogen and progesterone; there are no menstrual periods for 12 consecutive months; and no other biological or physiological cause can account for this. Menopause is the end of...
  8. Natural pacemaker Natural pacemaker
    Natural pacemaker: The natural pacemaker of the heart is the sinus node, one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulatin...
  9. Naturalistic study Naturalistic study
    Naturalistic study: A type of study in which the researcher very carefully observes and records some behavior or phenomenon, sometimes over a prolonged period, in its natural setting while interfering as little as possible with the subjects or phenomena. In medical research, a naturalistic study us...
  10. Nature (journal) Nature (journal)
    Nature (journal): The name of a venerable British scientific journal that has over the past century or so published much of importance to medicine and the biomedical sciences. There are now, in fact, eight publications in the Nature family of journals: The weekly Nature (founded in 1869), and Seven...
  11. Naturopath Naturopath
    Naturopath: A person who practices naturopathy, a drugless system of therapy based on the use of physical forces such as heat, water, light, air and massage. ...
  12. Naturopathic Naturopathic
    Naturopathic: Pertaining to naturopathy....
  13. Naturopathic medicine Naturopathic medicine
    Naturopathic medicine: See: Naturopathy....
  14. Naturopathy Naturopathy
    Naturopathy: A system of therapy based on preventative care, and on the use of heat, water, light, air, and massage as primary therapies for disease. Some naturopaths use no medications, either pharmaceutical or herbal. Some recommend herbal remedies only. A few who are licensed to prescribe ma...
  15. Nausea Nausea
    Nausea: Nausea, is the urge to vomit. It can be brought by many causes including, systemic illnesses, such as influenza, medications, pain, and inner ear disease. When nausea and/or vomiting are persistent, or when they are accompanied by other severe symptoms such as abdominal pain, jaundice, fever...