Shaped like an oblong shield; shield-shaped; as, the thyroid cartilage.

Of or pertaining to the thyroid body, thyroid cartilage, or thyroid artery; thyroideal.

Gland at the base of the neck that produces hormones which control the metabolic rate (how much energy the body uses) and level of calcium in the blood. Cancer of the thyroid is often treated with Iodine 131.

The thyroid is a small gland in the neck that makes and stores hormones that help regulate heart rate, blood pressure, body temperature, and the rate at which food is converted into energy.