Webster's New World Medical Dictionary

lymphoproliferative disorders
Malignant dis-
eases of the lymphoid cells and of cells from the
reticuloendothelial system that usually occur in
people with compromised immune systems, such as
patients with AIDS and recent transplant patients.
Lymphoproliferative disorders can be associated
with Epstein-Barr virus infection. See also 
Epstein-
Barr virus.
lymphoreticulosis, benign
See 
cat scratch
fever.
-lysis
Suffix indicating destruction, as in hemoly-
sis (the destruction of red blood cells with the
release of hemoglobin).
-lytic
Suffix having to do with lysis, as in
hemolytic anemia (anemia due to the destruction of
red blood cells).
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-lytic
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M protein
An antibody or part of an antibody that
is found in unusually large amounts in the blood or
urine of patients with multiple myeloma, a form of
cancer that arises in plasma cells.
MAC
1
Mycobacterium avium complex. 
2
Membrane attack complex.
Macewen operation
A surgical operation to
repair inguinal hernia that was designed by Scottish
surgeon Sir William Macewen.
machine, heart-lung
See 
heart-lung machine.
macro-
Prefix meaning large or long, as macro-
cephaly (an abnormally large head) and
macrosomia (an overly large body). The opposite of
macro- is micro-.
macroangiopathy
A disease of the large blood
vessels in which fat and blood clots build up and
stick to the vessel walls, blocking the flow of blood.
Types of macroangiopathy include coronary artery
disease (macroangiopathy in the heart), cere-
brovascular disease (macroangiopathy in the
brain), and peripheral vascular disease (macroan-
giopathy that affects, for example, vessels in the
legs).