| an enlargement of the thyroid gland on the front and sides of the neck, usually symptomatic of abnormal thyroid secretion, esp. hypothyroidism due to a lack of iodine in the diet. |

goiter goi·ter (goi'tər)
n.
A noncancerous enlargement of the thyroid gland, visible as a swelling at the front of the neck, that is often associated with iodine deficiency.