Webster's New World Medical Dictionary

invasive cancer
Cancer that has spread from the
site of origin to deeper tissues or to other parts of
the body.
inversion, chromosome
See 
chromosome
inversion.
invest
In medicine, to envelop, cover, or embed.
For example, a dentist might invest a patient’s teeth
with a wax material in order to form a mold of it.
involution
A retrograde change. After treatment,
a tumor may involute; with advancing age, there may
be physical and emotional involution.
iodide
The form to which iodine in the diet is
reduced before being absorbed through the intes-
tinal wall into the bloodstream and carried to the
thyroid gland. See also 
iodine.
iodide goiter
See 
iodine excess.
iodine
An element in the diet that is essential for
the manufacture of hormones by the thyroid gland.
The thyroid gland uses iodine to make thyroxine
(T4), which has four iodine molecules attached to
its structure, and triiodothyronine (T3), which has
three iodine molecules attached. Iodine is found in
seafood, bread, iodized salt, and seaweed.
iodine deficiency
A lack of sufficient iodine in
the diet, which can lead to inadequate production of
thyroid hormone (hypothyroidism) and enlarge-
ment of the thyroid gland (goiter). Since the addi-
tion of iodine to table salt became common, iodine
deficiency has rarely been seen in the US.
intravenous gamma globulin
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iodine excess
Prolonged intake of too much
iodine that leads to swelling of the thyroid gland
(goiter) and abnormally low thyroid activity
(hypothyroidism). Certain foods and medications
contain large amounts of iodine, including seaweed;
iodine-rich expectorants such as SSKI and Lugol’s
solution that are used to treat cough, asthma, and
chronic pulmonary disease; and amiodarone
(brand name: Cardorone), an iodine-rich medica-
tion used to control abnormal heart rhythms.