Webster's New World Medical Dictionary

macrobiota
The living organisms of a region that
are large enough to be seen with the naked eye.
macrobiotic
Referring to the macrobiota, a
region’s living organisms that are large enough to be
seen with the naked eye.
macrobiotic diet
A diet that incorporates
Ayurvedic principles of food combining, is based
mainly on brown rice and vegetables, and claims to
lengthen life. The macrobiotic diet is strictly not rec-
ommended for pregnant women or children and
may not provide sufficient protein and nutrients for
others.
macrocephaly
An abnormally large head. The
opposite of macrocephaly is microcephaly.
Macrocephaly can be a normal variant or be a sign
of pressure within the growing head during child-
hood, such as from hydrocephalus.
macrocytic
Literally, referring to any abnormally
large cell; in practice, referring to an abnormally
large red blood cell. For example, macrocytic ane-
mia is characterized by abnormally large red blood
cells. The opposite of macrocytic is microcytic.
macrogenitosomia
A condition in which the
external sex organs are prematurely or abnormally
enlarged. Macrogenitosomia is associated with hor-
monal disorders that may also create changes in the
internal sex organs.
macroglobulinemia
A condition in which the
blood contains high levels of large proteins and is
too thick to flow through small blood vessels. The
large protein is an antibody called macroglobulin or
IgM. One type of macroglobulinemia is Waldenström
macroglobulinemia, a type of cancer.
macroglossia
An abnormally large tongue.
Macroglossia is sometimes said to be associated with
Down syndrome, but in that disorder the tongue is
actually large only in relationship to a smaller-than-
normal mouth cavity.
macrognathia
An abnormally large jaw.
Macrognathia can be associated with pituitary gigan-
tism, tumors, and other disorders. Macrognathia
can often be corrected with surgery. Also known as
prognathic mandible.