Webster's New World Medical Dictionary

G
Glaucoma
S
Diabetes
These code letters are cautions for patients with specific medical problems. A person with a medical problem,
such as high blood pressure, might see the generic “C” code on a prescription bottle if the medication could
raise his or her blood pressure.
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anterior
The front, as opposed to posterior. For
example, the breastbone is part of the anterior sur-
face of the chest.
anteroposterior
From front to back, as opposed
to posteroanterior. Abbreviated AP. For example,
when a chest X-ray is taken with the patient’s back
against the film plate and the X-ray machine in front
of the patient, it is referred to as an AP view.
ascending
Going upward. For example, the
ascending aorta is the portion of the aorta that
ascends, going upward as it leaves the heart to form
the beginning of the arch of the aorta.
caudad
Toward the feet (or tail, in embryology),
as opposed to cranial.
cranial
Toward the head, as opposed to caudad.
deep
Away from the exterior surface or farther
into the body, as opposed to superficial.
descending
Going down. For example, the
descending aorta is the portion of the aorta that
descends, going downward from the top of the arch
of the aorta.
distal
Farther from the beginning, as opposed to 
proximal.
dorsal
The back, as opposed to ventral.
external
Situated on the outside.
extra
Prefix indicating outside of.
horizontal
Parallel to the floor; a plane that
passes through the standing body parallel to the
floor.