Webster's New World Medical Dictionary

night blindness
See 
nyctanopia.
night eating syndrome
An eating disorder esti-
mated to affect between 1 percent and 2 percent of
adults in which at least 50 percent of the daily food
intake is consumed after dinner. Abbreviated NES.
The causes of NES have not been understood, but an
impaired circadian rhythm of food intake is believed
to play a role. Stress can worsen the condition.
night sweats
Severe hot flashes that occur at
night and result in a drenching sweat. Night sweats
can have many different causes, including medica-
tions, infections, and cancers.
NIH
National Institutes of Health.
Nipah virus
A member of the paramyxovirus
family isolated from samples from an outbreak of
encephalitis and respiratory illness among adult
men in Malaysia and Singapore in 1999 that causes
a sometimes fatal form of viral encephalitis. The
humans were infected by close contact with infected
pigs. Symptoms include high fever and aches, coma,
and sometimes death. 
nipple
The pigmented projection on the surface
of the chest in the male and the breast in the female.
In the mature female, ducts that conduct milk from
the mammary glands to the surface of the breast exit
through the nipple. The surrounding flat area of pig-
mentation is the areola.
nipple absence
See 
athelia.
newborn screening
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nipple, supernumerary
An extra nipple.
Supernumerary nipples are usually smaller than
normal and vestigial (nonfunctional, without
accompanying mammary glands). They tend to
occur along a roughly curved line that extends from
near the armpit, through the center of the normal
breast, and down to the lower abdomen. This distri-
bution is very similar to the location of nipples on
mammals that have multiple nipples along the
underbelly. Supernumerary nipples do not cause
problems and do not need to be removed.