Webster's New World Medical Dictionary

scrotum
The pouch of skin that contains the
testes, epididymides, and lower portions of the
spermatic cords.
scrub typhus
See 
typhus, scrub.
scurvy
A disorder that is caused by lack of vita-
min C. Symptoms include anemia; soft, bleeding
gums; and bumps under the skin near muscles.
Scurvy in early childhood can cause musculoskele-
tal problems. Treatment involves including foods
that are high in vitamin C in the diet and taking vita-
min C supplements if necessary.
seasonal affective disorder
Depression that
tends to occur (and recur) during a particular time
of year, most often as the days grow shorter in the
fall and winter. Abbreviated SAD. Affected persons
may react adversely to decreasing amounts of light
or colder temperatures, which affect the production
of neurotransmitters in the brain. Also known as
winter blues, winter depression, and hibernation
reaction. 
sebaceous cyst
See 
cyst, sebaceous.
sebaceous gland
See 
gland, sebaceous.
seborrhea
See 
dandruff.
seborrheic keratosis
See 
keratosis, seborrheic.
sebum
An oily secretion of the sebaceous glands
that helps to preserve the flexibility of the hair and
retain moisture in the skin. Sebum is also secreted
by the Meibomian glands of the eyes. See also 
gland,
Meibomian.
Seckel syndrome
A rare inherited form of
dwarfism and growth delay. Other symptoms and
features associated with Seckel syndrome include
an abnormally small head (microcephaly); varying
degrees of mental retardation; and/or unusual char-
acteristic facial features including “beak-like” pro-
trusion of the nose. The syndrome is inherited in an
autosomal recessive manner and can be due to
mutations in several different genes. Also known as
bird-headed dwarfism, microcephalic primordial
dwarfism, nanocephalic dwarfism, and Seckel-type
dwarfism. See also 
dwarfism.