Webster's New World Medical Dictionary

chlamydia
The agent of a sexually transmitted
disease, a type of bacteria found in the cervix, ure-
thra, throat, or rectum that acts very much like gon-
orrhea in the way it is spread, the symptoms it
produces, and its long-term consequences.
Chlamydia is destructive to the Fallopian tubes,
causing infertility, tubal pregnancy, and severe
pelvic infection. It is common for infected women to
have no symptoms. Chlamydia is associated with an
increased incidence of preterm births. Also, an
infant can acquire the disease during passage
through the birth canal, leading to eye problems or
pneumonia. Chlamydia is one of the reasons new-
borns are routinely treated with antibiotic eyedrops.
Chlamydia can also cause inflammation of the ure-
thra, epididymis, and rectum in men. A chronic
form of arthritis, called reactive arthritis, can
develop after chlamydia infection.
chloroform
A clear, volatile liquid with a strong
smell similar to that of ether. Chloroform was once
administered by inhalation to produce anesthesia,
given to relieve pain, and used as a remedy for
cough. It is quite toxic to the kidneys and the liver.
choana
The passageway from the back of one
side of the nose to the throat. There are two
choanae, one on either side of the nose. The
choanae must be open to permit breathing through
the nose.
chocolate
A food or flavoring made from the
seeds of the cacao or chocolate tree 
(Theobroma
cacao)
. Chocolate is rich in flavinoids, compounds
that act as antioxidants. Flavinoids may also lower
blood pressure and improve blood flow by opening
blood vessels. Thus, chocolate may have health ben-
efits, provided it is consumed in moderation.
choked disk
See 
papilledema.
choking