Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «N»:
Nonbacterial prostatitis: Inflammation of the prostate not due to bacterial infection. The prostate is a walnut-sized organ below the male bladder that surrounds the urethra and contributes fluid to the semen.
Nonbacterial prostatitis is typically a chronic, painful disease. The symptoms (including ...
Nonblinded study: A clinical trial or other experiment in which the researchers know what treatments are being given to each study subject or experimental group. If human subjects are involved, they know what treatments they are receiving....
Noncoding DNA: The strand of DNA that does not carry the information necessary to make proteins. DNA normally has two strands -- the coding strand and the non-coding strand. Although these strands are exact mirror images of one another, only the coding strand contains the information for making prot...
Noncompliance: The failure or refusal to comply: the failure or refusal to conform and adapt one's actions to a rule or to necessity.
The term "noncompliance" is used in medicine particularly in regard to a patient not taking a prescribed medication or following a prescribed course of therapy. For...
Nondipper: A person in whom there is an absence of the normal nocturnal fall (dip) in blood pressure. Nondipper status has been shown to be an additional risk factor for the development of adverse cardiovascular events. Nondipping is also common after kidney transplant. The opposite of a nondipper i...
Nondisjunction: Failure of paired chromosomes to
(separate) during cell division so that both chromosomes go to one
daughter cell and none to
the other. Nondisjunction causes errors in chromosome number such as
trisomy 21 (Down's
syndrome) and monosomy X (Turner syndrome)....
Nonepidermolytic palmoplantar keratoderma
Nonepidermolytic palmoplantar keratoderma: See: Tylosis with esophageal cancer....
Nonlymphocytic leukemia, acute
Nonlymphocytic leukemia, acute: Abbreviated ANLL. More commonly called acute myeloid leukemia (AML). A quickly progressive malignant disease in which there are too many immature blood-forming cells in the blood and bone marrow, the cells being specifically those destined to give rise to the granuloc...
Nonmelanoma skin cancer
Nonmelanoma skin cancer: Skin cancer that does not involve
melanocytes. Basal cell cancer and squamous cell cancer are nonmelanoma skin cancers....
Nonocular type Stickler syndrome
Nonocular type Stickler syndrome: Stickler syndrome, type III. See: Stickler syndrome....
Nonoxynol: Nonoxynol-9 is the most commonly encountered spermatocide in the United States. As with other spermatocides, it destroys spermatozoa; it kills sperm.
The nonoxynols, technically speaking, are nonionic surfactant [surface active] mixtures that vary in the number of repeating ethoxy groups...
Nonpathogenic: Incapable of causing disease.
Nonpathogenic bacteria are harmless. By contrast, pathogenic bacteria can cause disease. For example, nonpathogenic E. coli are E. coli that are innocuous (like most E. coli) while pathogenic E. coli can make you sick.
The word "pathogenic" comes from tw...
Nonpenetrant trait: A genetic trait (characteristic) that is present in the genome but does not manifest itself in the individual. By contrast, a penetrant trait is one that manifests itself.
If, for example, if 100 people have a particular genetic trait but only 80 of them express it, the penetranc...
Nonrandom: Not by chance alone. Not in keeping with the process by which an outcome is determined solely by chance, for example, by a coin flip.
The opposite of nonrandom is random....
classification of testicular cancers that arise in specialized sex cells called
germ cells. Nonseminomas include embryonal carcinoma,
teratoma, choriocarcinoma, and yolk sac tumor. ...