Webster's New World Medical Dictionary

normal pressure hydrocephalus
See 
hydro-
cephalus, normal pressure.
normal range
Characteristic of 95 percent of
values from a normal population. The remaining
normal results fall outside the normal range, as do
any truly abnormal results. The normal range for a
particular test result, condition, symptom, or behav-
ior may differ, based on the patient’s age, size, sex,
ethnicity, or culture.
norovirus
One of a group of viruses that cause
the “stomach flu,” or gastroenteritis. The term
norovirus was approved as the official name for this
group of viruses. Several other names have been
used for noroviruses, including Norwalk-like
viruses, caliciviruses (because they belong to the
virus family 
Caliciviridae
), and small round struc-
tured viruses. The virus is spread primarily from
one infected person to another by the fecal-oral
route. The characteristic symptoms are nausea,
vomiting, diarrhea, and abdominal cramping that
develop 1 or 2 days after contaminated food or
water is consumed. Symptoms typically last for 24 to
60 hours. Illness severe enough to require hospital-
ization is unusual. Fever, if present, is low-grade.
noncompliance
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North Asian tick-borne rickettsiosis
See
rickettsiosis, North Asian tick-borne.
Norwalk virus
The prototype virus of the genus
Norovirus. See 
norovirus.
nose
The external midline projection from the
face. The purpose of the nose is to warm, clean, and
humidify the air that a person breathes. In addition,
it helps a person to smell and taste. The nose is
divided into two passageways by a partition called
the septum. Opening to these passageways are the
nostrils. Bony projections, called turbinates, pro-
trude into each breathing passage; they help to
increase the surface area of the inside of the nose.
There are three turbinates on each side of the nose
(the inferior, middle, and superior turbinates). The
sinuses are four paired air-filled chambers that
empty into the nasal cavity.
nose, runny
The production of extra mucus by
the nose. Rhinorrhea is the medical term for this
common problem. The nose makes extra mucus
whenever something that is in the nose, such as
pollen or dust, needs to be removed. Mucus forma-
tion is also part of the histamine reaction to aller-
gies and of the body’s defenses during respiratory
infections.