A prefix meaning large, as in
macrophage (a large cell in the
A dietary system in which
foods with a balance of
yin and yang
are eaten. Foods are classified as yin or
yang depending on factors such as
their colour, texture, and taste.
Abnormal enlargement of
the tongue. Macroglossia is a feature
. It is also caused by
some tumours of the tongue, such as a
A class of
used to treat a wide range of infec-
tions including those of the ear, nose,
throat, respiratory and gastrointestinal
tracts, and skin. Common macrolides
A cell in the
Macrophages are large
which can engulf and destroy micro-
organisms and other foreign particles.
They are found in most body tissues.
The area of the eye's
responsible for seeing fine detail. The
macula surrounds the
tains the highest density of visual cells.
painless disorder affecting the
The result is a roughly circular area of
blindness that increases in size until it
is large enough to obscure 2 or 3 words
at reading distance. Macular degenera-
tion does not cause total blindness as
vision is retained around the edges of
the visual fields. This condition is a
common disorder in elderly people.
Of the 2 types of macular degenera-
tion that may occur, one type is usually
. There is no
treatment for the other form, although
the affected person may benefit from
aids such as magnifying instruments.
A spot that is level with the
skin's surface and discernible only by
difference in colour or texture.
mad cow disease
The commonly used
bovine spongiform enceph-
An element essential in
the diet for the formation of bones and
teeth, muscle contraction, nerve impulse
transmission, and activation of many
Dietary sources include cere-
als, nuts, soya beans, milk, and fish.
compound used as a
compound used in
Impaired absorption of
nutrients by the lining of the small
intestine. Malabsorption may be caused
by many conditions, including
creatitis, coeliac disease, Crohn's disease,
amyloidosis, giardiasis, Whipple's dis-
The removal of
some of the small intestine, and certain
operations on the stomach, may also
result in malabsorption.
Common symptoms are diarrhoea and
weight loss; and in severe cases, there
may also be malnutrition (see
. Diagnosis may
be made by tests on faeces,
barium X-ray examination
. In most cases, dietary modifica-
tions or supplements are successful in