Webster's New World Medical Dictionary

MEDEVAC
See 
MEDVAC.
medial
The side of the body or the side of a body
part that is nearest to the middle or center
(median) of the body. For example, when referring
to the knee, medial would mean the side of the knee
that is closest to the other knee. The opposite of
medial is lateral. See also Appendix B, “Anatomic
Orientation Terms.”
medial collateral ligament of the knee
The
ligament that straps the inner side of the knee joint,
providing stability and strength. See also 
knee.
medial meniscus of the knee
A thickened,
crescent-shaped cartilage pad in the inner portion
of the joint formed by the femur (the thigh bone)
and the tibia (the shin bone). The medial meniscus
is in the inner side, whereas the lateral meniscus is
in the outer side of this knee joint. The meniscus
acts as a smooth surface for the joint to move on,
serves to evenly load the surface during weight-
bearing, and aids in disbursing joint fluid for joint
lubrication. See also 
knee.
median
The middle, as in the median strip in a
highway. For example, the median nerve is the nerve
the runs through the middle of the wrist.
mediastinoscopy
A procedure in which the
physician inserts a tube into the chest to view the
organs in the mediastinum. The tube is inserted
through an incision above the breastbone.
mediastinotomy
The surgical opening of the
mediastinum. See also 
mediastinum; medi-
astinoscopy.
mediastinum
The area between the lungs. The
organs in the mediastinum include the heart and its
large veins and arteries, the trachea, the esophagus,
the bronchi, and lymph nodes.
Medicaid
A number of US programs of public
assistance for persons whose income is insufficient
to pay for health care, regardless of age. Medicaid is
administered on a state level, with the federal gov-
ernment providing matching funds to state Medicaid
programs. Services and options can vary from state
to state. Disabled persons who receive Social
Security income (SSI), among others, are automat-
ically eligible for Medicaid. To apply for Medicaid,
one should contact the local Social Security, public
health, or disability services office.