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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «N»:

  1. Neurotransmitter Neurotransmitter
    Neurotransmitter: A chemical that is released from a nerve cell which thereby transmits an impulse from a nerve cell to another nerve, muscle, organ, or other tissue. A neurotransmitter is a messenger of neurologic information from one cell to another....
  2. Neutral foot type Neutral foot type
    Neutral foot type: The most common type of foot. A runner with a neutral type of foot lands on the heel and rolls forward during the gait cycle until the impact is distributed evenly across the forefoot....
  3. Neutral posture Neutral posture
    Neutral posture: The posture when the joints are not bent and the spine is aligned and not twisted. Working in neutral postures is preferable to working while twisting the back or bending the wrists....
  4. Neutropenia Neutropenia
    Neutropenia: Not enough neutrophils, neutrophils being a type of white blood cell (specifically a form of granulocyte) filled with neutrally-staining granules, tiny sacs of enzymes that help the cell to kill and digest microorganisms it has engulfed by phagocytosis. The mature neutrophil has a segme...
  5. Neutropenia, severe congenital (SCN) Neutropenia, severe congenital (SCN)
    Neutropenia, severe congenital (SCN): Children born with this condition lack neutrophils (a type of white blood cell that is important in fighting infection). These children suffer frequent infections from bacteria which in the past led to death in three-quarters of cases before 3 years of age. This...
  6. Neutrophil Neutrophil
    Neutrophil: A type of white blood cell, specifically a form of granulocyte, filled with neutrally-staining granules, tiny sacs of enzymes that help the cell to kill and digest microorganisms it has engulfed by phagocytosis. The mature neutrophil has a segmented nucleus (it is called a seg or poly) w...
  7. Neutrophilia Neutrophilia
    Neutrophilia: More than the normal number of neutrophils, a type of white blood cell (specifically a form of granulocyte) filled with neutrally-staining granules, tiny sacs of enzymes that help the cell to kill and digest microorganisms it has engulfed by phagocytosis. The mature neutrophil has a s...
  8. Nevi Nevi
    Nevi: The plural of nevus....
  9. Nevoid basal cell carcinoma syndrome Nevoid basal cell carcinoma syndrome
    Nevoid basal cell carcinoma syndrome: The Gorlin syndrome....
  10. Nevus Nevus
    Nevus: 1. Any birthmark. 2. A benign pigmented spot on the skin such as a mole (a cluster of melanocytes and supportive tissue that appears as a tan, brown, or flesh-colored spot on the skin). 3. A benign blood vessel tumor on the skin such as a vascular nevus, a local collection of capillaries of t...
  11. New Engl J Med New Engl J Med
    New Engl J Med: The New England Journal of Medicine....
  12. New England Journal of Medicine New England Journal of Medicine
    New England Journal of Medicine: Despite its regional name, The New England Journal of Medicine (NEJM) is far from provincial. It is an eminent weekly national and international general medical journal, devoted to no single specialty, but to all of medicine. The Journal is published by the Massachus...
  13. New variant Creutzfeldt-Jakob disease New variant Creutzfeldt-Jakob disease
    New variant Creutzfeldt-Jakob disease: Abbreviated nvCJD. A human disease thought due to the same infectious agent as bovine spongiform encephalopathy (BSE), or mad cow disease. Both the human and bovine disorders are invariably fatal brain diseases with unusually long incubation periods measured in...
  14. New, fear of the New, fear of the
    New, fear of the: An irrational fear of anything new, of innovation, of new situations, places, or things. Also called neophobia. In animal behavior, neophobia refers to the tendency of an animal to avoid or retreat from an unfamiliar object or situation. All phobias are unreasonable sorts of fea...
  15. Newborn hearing screen Newborn hearing screen
    Newborn hearing screen: Testing of the newborn baby's ability to hear. Newborn screening of hearing is done with automated auditory brainstem response tests or, less often, with what are called otoacoustic emission or conventional auditory brainstem response tests. The aim is to detect those babies ...