Webster's New World Medical Dictionary

Stevens-Johnson syndrome
A serious systemic
(bodywide) allergic reaction with a characteristic
rash involving the skin and mucous membranes,
including the buccal mucosa (inside of the mouth),
conjunctiva, and genital areas. Abbreviated SJS. The
disease is due to a hypersensitive (allergic) reaction
to one of a number of immunologic stimuli includ-
ing drugs and infectious agents. Complications can
include hepatitis, nephritis, gastrointestinal bleed-
ing, pneumonia, arthritis, arthralgia, fever, and
myalgia. The diagnosis of SJS is usually made when
the characteristic rash appears 1 to 3 weeks after
exposure to a known stimulus and it cannot be
explained by another diagnosis. The treatment
depends, in part, on the suspected precipitating
cause. Also known as erythema multiforme.
stiff baby syndrome
See 
hyperexplexia.
stillbirth
The birth of a dead baby, the delivery of
a fetus that has died before birth for which there is
no possibility of resuscitation. The distinction
between a stillbirth and a miscarriage is arbitrary.
The dividing line has variously set at 20 to 24 weeks
of gestation or at a specific weight, such as 500g.
Before that time it is a miscarriage, and after that
time it is a stillbirth.
Still’s disease
See 
arthritis, systemic-onset
juvenile rheumatoid.
sting, Africanized bee
See 
bee sting,
Africanized.
sting, bee
See 
bee sting.
sting, insect
See 
insect sting.
stoma
An opening into the body from the outside
that is created by a surgeon.
stereotactic
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stomach
The digestive organ that is located in the
upper abdomen, under the ribs. The upper part of
the stomach connects to the esophagus, and the
lower part leads into the small intestine. When food
enters the stomach, muscles in the stomach wall
create a rippling motion (peristalsis) that mixes and
mashes the food. At the same time, juices made by
glands in the lining of the stomach help digest the
food. After about 3 hours, the food becomes a liq-
uid and moves into the small intestine, where diges-
tion continues.