Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «N»:
Nonsense codon: See: Stop codon....
Nonsense mutation: A mutation (a change) in a base in the DNA that prematurely stops the translation (reading) of messenger RNA (mRNA) resulting in a polypeptide chain that ends prematurely and a protein product that is truncated (abbreviated) and incomplete and usually nonfunctional.
Nonsteroidal anti-inflammatory drug
Nonsteroidal anti-inflammatory drug: A type of drug commonly prescribed for the treatment of inflammation of arthritis and other body tissues, such as in tendinitis and bursitis.
Examples of NSAIDs include aspirin, indomethacin (Indocin), ibuprofen
(Motrin), naproxen (Naprosyn), piroxicam (Felden...
Nonstructural scoliosis: A structurally normal spine that appears to have a lateral curve (scoliosis).
Nonstructural scoliosis involves a temporary change of spinal curvature. This is caused by an underlying condition such as a difference in leg length, muscle spasms, or inflammatory conditions, (e....
Nonsyndromic: Not part of a syndrome. Hearing loss, for instance, can be syndromic or nonsyndromic....
Nonsyndromic deafness: Hearing loss which is not part of a syndrome. Deafness with no related signs and symptoms affecting other parts of the body....
Nook Barker: See: Barker, Horace Albert....
Noonan syndrome (NS)
Noonan syndrome (NS): A multifaceted genetic disorder characterized by a series of birth defects (congenital malformations) including dysmorphic (malformed) facial features, short stature after birth (postnatal growth retardation), webbing of the neck (pterygium colli), caved-in chestbone (pectus
Normal growth rate
Normal growth rate: The speed with which normal growth occurs in length before birth and in height after birth.
Fetal growth is critical to a person's eventual height. Before birth, the key measure is the crown-rump length -- the distance from the top of the head (the crown) to the buttocks (the ru...
Normal pressure hydrocephalus
Normal pressure hydrocephalus: A specific form of hydrocephalus in which the central cavities of the inner brain (the ventricles) enlarge at the expense of the substance of the brain, while the pressure of the CSF remains within normal range. Normal pressure hydrocephalus (NPH) is due usually to a ...
Normal range: By convention, the normal range for whatever (a particular test, condition, symptom, behavior, etc.) is set to cover ninety-five percent (95%) of all values from the general population. Five percent (5%) of results consequently fall outside the normal range. Values that prove normal ca...
Normal tension glaucoma
Normal tension glaucoma: See: Glaucoma, normal tension....
Normotensive: Having normal blood pressure. See also: Hypertensive; Hypotensive....
Normoxia: Normal levels of oxygen. From norm- (normal) + -ox- (oxygen) + -ia = a normal oxygen state....
Norovirus: A group of viruses that are a common cause of food poisoning and acute gastroenteritis ("stomach flu") that can strike quickly with force and make a person feel very sick but which typically resolves within 2-3 days. The characteristic symptoms are nausea, vomiting, diarrhea, and abdomina...